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02d8454002
importlib.abc.Loader.exec_module() is also defined. Before this change, create_module() was optional **and** could return None to trigger default semantics. This change now reduces the options for choosing default semantics to one and in the most backporting-friendly way (define create_module() to return None).
679 lines
25 KiB
Python
679 lines
25 KiB
Python
from . import util
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abc = util.import_importlib('importlib.abc')
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init = util.import_importlib('importlib')
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machinery = util.import_importlib('importlib.machinery')
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importlib_util = util.import_importlib('importlib.util')
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import os
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import sys
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from test import support
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import types
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import unittest
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import warnings
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class DecodeSourceBytesTests:
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source = "string ='ü'"
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def test_ut8_default(self):
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source_bytes = self.source.encode('utf-8')
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self.assertEqual(self.util.decode_source(source_bytes), self.source)
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def test_specified_encoding(self):
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source = '# coding=latin-1\n' + self.source
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source_bytes = source.encode('latin-1')
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assert source_bytes != source.encode('utf-8')
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self.assertEqual(self.util.decode_source(source_bytes), source)
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def test_universal_newlines(self):
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source = '\r\n'.join([self.source, self.source])
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source_bytes = source.encode('utf-8')
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self.assertEqual(self.util.decode_source(source_bytes),
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'\n'.join([self.source, self.source]))
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(Frozen_DecodeSourceBytesTests,
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Source_DecodeSourceBytesTests
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) = util.test_both(DecodeSourceBytesTests, util=importlib_util)
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class ModuleFromSpecTests:
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def test_no_create_module(self):
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class Loader:
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def exec_module(self, module):
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pass
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spec = self.machinery.ModuleSpec('test', Loader())
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with warnings.catch_warnings(record=True) as w:
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warnings.simplefilter('always')
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module = self.util.module_from_spec(spec)
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self.assertEqual(1, len(w))
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self.assertTrue(issubclass(w[0].category, DeprecationWarning))
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self.assertIn('create_module', str(w[0].message))
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self.assertIsInstance(module, types.ModuleType)
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self.assertEqual(module.__name__, spec.name)
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def test_create_module_returns_None(self):
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class Loader(self.abc.Loader):
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def create_module(self, spec):
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return None
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spec = self.machinery.ModuleSpec('test', Loader())
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module = self.util.module_from_spec(spec)
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self.assertIsInstance(module, types.ModuleType)
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self.assertEqual(module.__name__, spec.name)
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def test_create_module(self):
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name = 'already set'
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class CustomModule(types.ModuleType):
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pass
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class Loader(self.abc.Loader):
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def create_module(self, spec):
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module = CustomModule(spec.name)
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module.__name__ = name
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return module
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spec = self.machinery.ModuleSpec('test', Loader())
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module = self.util.module_from_spec(spec)
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self.assertIsInstance(module, CustomModule)
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self.assertEqual(module.__name__, name)
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def test___name__(self):
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spec = self.machinery.ModuleSpec('test', object())
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module = self.util.module_from_spec(spec)
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self.assertEqual(module.__name__, spec.name)
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def test___spec__(self):
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spec = self.machinery.ModuleSpec('test', object())
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module = self.util.module_from_spec(spec)
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self.assertEqual(module.__spec__, spec)
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def test___loader__(self):
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loader = object()
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spec = self.machinery.ModuleSpec('test', loader)
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module = self.util.module_from_spec(spec)
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self.assertIs(module.__loader__, loader)
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def test___package__(self):
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spec = self.machinery.ModuleSpec('test.pkg', object())
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module = self.util.module_from_spec(spec)
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self.assertEqual(module.__package__, spec.parent)
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def test___path__(self):
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spec = self.machinery.ModuleSpec('test', object(), is_package=True)
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module = self.util.module_from_spec(spec)
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self.assertEqual(module.__path__, spec.submodule_search_locations)
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def test___file__(self):
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spec = self.machinery.ModuleSpec('test', object(), origin='some/path')
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spec.has_location = True
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module = self.util.module_from_spec(spec)
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self.assertEqual(module.__file__, spec.origin)
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def test___cached__(self):
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spec = self.machinery.ModuleSpec('test', object())
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spec.cached = 'some/path'
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spec.has_location = True
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module = self.util.module_from_spec(spec)
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self.assertEqual(module.__cached__, spec.cached)
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(Frozen_ModuleFromSpecTests,
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Source_ModuleFromSpecTests
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) = util.test_both(ModuleFromSpecTests, abc=abc, machinery=machinery,
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util=importlib_util)
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class ModuleForLoaderTests:
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"""Tests for importlib.util.module_for_loader."""
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@classmethod
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def module_for_loader(cls, func):
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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return cls.util.module_for_loader(func)
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def test_warning(self):
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# Should raise a PendingDeprecationWarning when used.
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with warnings.catch_warnings():
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warnings.simplefilter('error', DeprecationWarning)
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with self.assertRaises(DeprecationWarning):
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func = self.util.module_for_loader(lambda x: x)
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def return_module(self, name):
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fxn = self.module_for_loader(lambda self, module: module)
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return fxn(self, name)
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def raise_exception(self, name):
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def to_wrap(self, module):
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raise ImportError
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fxn = self.module_for_loader(to_wrap)
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try:
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fxn(self, name)
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except ImportError:
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pass
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def test_new_module(self):
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# Test that when no module exists in sys.modules a new module is
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# created.
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module_name = 'a.b.c'
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with util.uncache(module_name):
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module = self.return_module(module_name)
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self.assertIn(module_name, sys.modules)
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self.assertIsInstance(module, types.ModuleType)
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self.assertEqual(module.__name__, module_name)
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def test_reload(self):
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# Test that a module is reused if already in sys.modules.
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class FakeLoader:
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def is_package(self, name):
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return True
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@self.module_for_loader
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def load_module(self, module):
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return module
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name = 'a.b.c'
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module = types.ModuleType('a.b.c')
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module.__loader__ = 42
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module.__package__ = 42
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with util.uncache(name):
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sys.modules[name] = module
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loader = FakeLoader()
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returned_module = loader.load_module(name)
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self.assertIs(returned_module, sys.modules[name])
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self.assertEqual(module.__loader__, loader)
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self.assertEqual(module.__package__, name)
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def test_new_module_failure(self):
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# Test that a module is removed from sys.modules if added but an
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# exception is raised.
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name = 'a.b.c'
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with util.uncache(name):
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self.raise_exception(name)
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self.assertNotIn(name, sys.modules)
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def test_reload_failure(self):
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# Test that a failure on reload leaves the module in-place.
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name = 'a.b.c'
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module = types.ModuleType(name)
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with util.uncache(name):
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sys.modules[name] = module
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self.raise_exception(name)
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self.assertIs(module, sys.modules[name])
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def test_decorator_attrs(self):
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def fxn(self, module): pass
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wrapped = self.module_for_loader(fxn)
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self.assertEqual(wrapped.__name__, fxn.__name__)
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self.assertEqual(wrapped.__qualname__, fxn.__qualname__)
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def test_false_module(self):
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# If for some odd reason a module is considered false, still return it
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# from sys.modules.
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class FalseModule(types.ModuleType):
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def __bool__(self): return False
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name = 'mod'
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module = FalseModule(name)
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with util.uncache(name):
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self.assertFalse(module)
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sys.modules[name] = module
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given = self.return_module(name)
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self.assertIs(given, module)
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def test_attributes_set(self):
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# __name__, __loader__, and __package__ should be set (when
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# is_package() is defined; undefined implicitly tested elsewhere).
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class FakeLoader:
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def __init__(self, is_package):
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self._pkg = is_package
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def is_package(self, name):
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return self._pkg
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@self.module_for_loader
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def load_module(self, module):
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return module
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name = 'pkg.mod'
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with util.uncache(name):
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loader = FakeLoader(False)
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module = loader.load_module(name)
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self.assertEqual(module.__name__, name)
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self.assertIs(module.__loader__, loader)
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self.assertEqual(module.__package__, 'pkg')
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name = 'pkg.sub'
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with util.uncache(name):
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loader = FakeLoader(True)
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module = loader.load_module(name)
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self.assertEqual(module.__name__, name)
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self.assertIs(module.__loader__, loader)
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self.assertEqual(module.__package__, name)
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(Frozen_ModuleForLoaderTests,
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Source_ModuleForLoaderTests
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) = util.test_both(ModuleForLoaderTests, util=importlib_util)
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class SetPackageTests:
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"""Tests for importlib.util.set_package."""
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def verify(self, module, expect):
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"""Verify the module has the expected value for __package__ after
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passing through set_package."""
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fxn = lambda: module
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wrapped = self.util.set_package(fxn)
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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wrapped()
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self.assertTrue(hasattr(module, '__package__'))
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self.assertEqual(expect, module.__package__)
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def test_top_level(self):
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# __package__ should be set to the empty string if a top-level module.
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# Implicitly tests when package is set to None.
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module = types.ModuleType('module')
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module.__package__ = None
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self.verify(module, '')
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def test_package(self):
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# Test setting __package__ for a package.
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module = types.ModuleType('pkg')
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module.__path__ = ['<path>']
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module.__package__ = None
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self.verify(module, 'pkg')
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def test_submodule(self):
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# Test __package__ for a module in a package.
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module = types.ModuleType('pkg.mod')
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module.__package__ = None
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self.verify(module, 'pkg')
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def test_setting_if_missing(self):
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# __package__ should be set if it is missing.
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module = types.ModuleType('mod')
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if hasattr(module, '__package__'):
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delattr(module, '__package__')
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self.verify(module, '')
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def test_leaving_alone(self):
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# If __package__ is set and not None then leave it alone.
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for value in (True, False):
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module = types.ModuleType('mod')
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module.__package__ = value
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self.verify(module, value)
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def test_decorator_attrs(self):
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def fxn(module): pass
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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wrapped = self.util.set_package(fxn)
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self.assertEqual(wrapped.__name__, fxn.__name__)
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self.assertEqual(wrapped.__qualname__, fxn.__qualname__)
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(Frozen_SetPackageTests,
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Source_SetPackageTests
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) = util.test_both(SetPackageTests, util=importlib_util)
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class SetLoaderTests:
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"""Tests importlib.util.set_loader()."""
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@property
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def DummyLoader(self):
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# Set DummyLoader on the class lazily.
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class DummyLoader:
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@self.util.set_loader
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def load_module(self, module):
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return self.module
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self.__class__.DummyLoader = DummyLoader
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return DummyLoader
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def test_no_attribute(self):
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loader = self.DummyLoader()
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loader.module = types.ModuleType('blah')
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try:
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del loader.module.__loader__
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except AttributeError:
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pass
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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self.assertEqual(loader, loader.load_module('blah').__loader__)
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def test_attribute_is_None(self):
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loader = self.DummyLoader()
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loader.module = types.ModuleType('blah')
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loader.module.__loader__ = None
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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self.assertEqual(loader, loader.load_module('blah').__loader__)
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def test_not_reset(self):
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loader = self.DummyLoader()
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loader.module = types.ModuleType('blah')
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loader.module.__loader__ = 42
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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self.assertEqual(42, loader.load_module('blah').__loader__)
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(Frozen_SetLoaderTests,
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Source_SetLoaderTests
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) = util.test_both(SetLoaderTests, util=importlib_util)
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class ResolveNameTests:
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"""Tests importlib.util.resolve_name()."""
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def test_absolute(self):
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# bacon
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self.assertEqual('bacon', self.util.resolve_name('bacon', None))
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def test_aboslute_within_package(self):
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# bacon in spam
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self.assertEqual('bacon', self.util.resolve_name('bacon', 'spam'))
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def test_no_package(self):
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# .bacon in ''
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with self.assertRaises(ValueError):
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self.util.resolve_name('.bacon', '')
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def test_in_package(self):
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# .bacon in spam
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self.assertEqual('spam.eggs.bacon',
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self.util.resolve_name('.bacon', 'spam.eggs'))
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def test_other_package(self):
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# ..bacon in spam.bacon
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self.assertEqual('spam.bacon',
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self.util.resolve_name('..bacon', 'spam.eggs'))
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def test_escape(self):
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# ..bacon in spam
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with self.assertRaises(ValueError):
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self.util.resolve_name('..bacon', 'spam')
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(Frozen_ResolveNameTests,
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Source_ResolveNameTests
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) = util.test_both(ResolveNameTests, util=importlib_util)
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class FindSpecTests:
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class FakeMetaFinder:
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@staticmethod
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def find_spec(name, path=None, target=None): return name, path, target
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def test_sys_modules(self):
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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loader = 'a loader!'
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spec = self.machinery.ModuleSpec(name, loader)
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module.__loader__ = loader
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module.__spec__ = spec
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sys.modules[name] = module
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found = self.util.find_spec(name)
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self.assertEqual(found, spec)
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def test_sys_modules_without___loader__(self):
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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del module.__loader__
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loader = 'a loader!'
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spec = self.machinery.ModuleSpec(name, loader)
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module.__spec__ = spec
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sys.modules[name] = module
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found = self.util.find_spec(name)
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self.assertEqual(found, spec)
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def test_sys_modules_spec_is_None(self):
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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module.__spec__ = None
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sys.modules[name] = module
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with self.assertRaises(ValueError):
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self.util.find_spec(name)
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def test_sys_modules_loader_is_None(self):
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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spec = self.machinery.ModuleSpec(name, None)
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module.__spec__ = spec
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sys.modules[name] = module
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found = self.util.find_spec(name)
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self.assertEqual(found, spec)
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def test_sys_modules_spec_is_not_set(self):
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name = 'some_mod'
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with util.uncache(name):
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module = types.ModuleType(name)
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try:
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del module.__spec__
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except AttributeError:
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pass
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sys.modules[name] = module
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with self.assertRaises(ValueError):
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self.util.find_spec(name)
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def test_success(self):
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name = 'some_mod'
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with util.uncache(name):
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with util.import_state(meta_path=[self.FakeMetaFinder]):
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self.assertEqual((name, None, None),
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self.util.find_spec(name))
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# def test_success_path(self):
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# # Searching on a path should work.
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# name = 'some_mod'
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# path = 'path to some place'
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# with util.uncache(name):
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# with util.import_state(meta_path=[self.FakeMetaFinder]):
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# self.assertEqual((name, path, None),
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# self.util.find_spec(name, path))
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def test_nothing(self):
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# None is returned upon failure to find a loader.
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self.assertIsNone(self.util.find_spec('nevergoingtofindthismodule'))
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def test_find_submodule(self):
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name = 'spam'
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subname = 'ham'
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with util.temp_module(name, pkg=True) as pkg_dir:
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fullname, _ = util.submodule(name, subname, pkg_dir)
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spec = self.util.find_spec(fullname)
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self.assertIsNot(spec, None)
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self.assertIn(name, sorted(sys.modules))
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self.assertNotIn(fullname, sorted(sys.modules))
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# Ensure successive calls behave the same.
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spec_again = self.util.find_spec(fullname)
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self.assertEqual(spec_again, spec)
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def test_find_submodule_parent_already_imported(self):
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name = 'spam'
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subname = 'ham'
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with util.temp_module(name, pkg=True) as pkg_dir:
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self.init.import_module(name)
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fullname, _ = util.submodule(name, subname, pkg_dir)
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spec = self.util.find_spec(fullname)
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self.assertIsNot(spec, None)
|
|
self.assertIn(name, sorted(sys.modules))
|
|
self.assertNotIn(fullname, sorted(sys.modules))
|
|
# Ensure successive calls behave the same.
|
|
spec_again = self.util.find_spec(fullname)
|
|
self.assertEqual(spec_again, spec)
|
|
|
|
def test_find_relative_module(self):
|
|
name = 'spam'
|
|
subname = 'ham'
|
|
with util.temp_module(name, pkg=True) as pkg_dir:
|
|
fullname, _ = util.submodule(name, subname, pkg_dir)
|
|
relname = '.' + subname
|
|
spec = self.util.find_spec(relname, name)
|
|
self.assertIsNot(spec, None)
|
|
self.assertIn(name, sorted(sys.modules))
|
|
self.assertNotIn(fullname, sorted(sys.modules))
|
|
# Ensure successive calls behave the same.
|
|
spec_again = self.util.find_spec(fullname)
|
|
self.assertEqual(spec_again, spec)
|
|
|
|
def test_find_relative_module_missing_package(self):
|
|
name = 'spam'
|
|
subname = 'ham'
|
|
with util.temp_module(name, pkg=True) as pkg_dir:
|
|
fullname, _ = util.submodule(name, subname, pkg_dir)
|
|
relname = '.' + subname
|
|
with self.assertRaises(ValueError):
|
|
self.util.find_spec(relname)
|
|
self.assertNotIn(name, sorted(sys.modules))
|
|
self.assertNotIn(fullname, sorted(sys.modules))
|
|
|
|
|
|
(Frozen_FindSpecTests,
|
|
Source_FindSpecTests
|
|
) = util.test_both(FindSpecTests, init=init, util=importlib_util,
|
|
machinery=machinery)
|
|
|
|
|
|
class MagicNumberTests:
|
|
|
|
def test_length(self):
|
|
# Should be 4 bytes.
|
|
self.assertEqual(len(self.util.MAGIC_NUMBER), 4)
|
|
|
|
def test_incorporates_rn(self):
|
|
# The magic number uses \r\n to come out wrong when splitting on lines.
|
|
self.assertTrue(self.util.MAGIC_NUMBER.endswith(b'\r\n'))
|
|
|
|
|
|
(Frozen_MagicNumberTests,
|
|
Source_MagicNumberTests
|
|
) = util.test_both(MagicNumberTests, util=importlib_util)
|
|
|
|
|
|
class PEP3147Tests:
|
|
|
|
"""Tests of PEP 3147-related functions: cache_from_source and source_from_cache."""
|
|
|
|
tag = sys.implementation.cache_tag
|
|
|
|
@unittest.skipUnless(sys.implementation.cache_tag is not None,
|
|
'requires sys.implementation.cache_tag not be None')
|
|
def test_cache_from_source(self):
|
|
# Given the path to a .py file, return the path to its PEP 3147
|
|
# defined .pyc file (i.e. under __pycache__).
|
|
path = os.path.join('foo', 'bar', 'baz', 'qux.py')
|
|
expect = os.path.join('foo', 'bar', 'baz', '__pycache__',
|
|
'qux.{}.pyc'.format(self.tag))
|
|
self.assertEqual(self.util.cache_from_source(path, True), expect)
|
|
|
|
def test_cache_from_source_no_cache_tag(self):
|
|
# No cache tag means NotImplementedError.
|
|
with support.swap_attr(sys.implementation, 'cache_tag', None):
|
|
with self.assertRaises(NotImplementedError):
|
|
self.util.cache_from_source('whatever.py')
|
|
|
|
def test_cache_from_source_no_dot(self):
|
|
# Directory with a dot, filename without dot.
|
|
path = os.path.join('foo.bar', 'file')
|
|
expect = os.path.join('foo.bar', '__pycache__',
|
|
'file{}.pyc'.format(self.tag))
|
|
self.assertEqual(self.util.cache_from_source(path, True), expect)
|
|
|
|
def test_cache_from_source_optimized(self):
|
|
# Given the path to a .py file, return the path to its PEP 3147
|
|
# defined .pyo file (i.e. under __pycache__).
|
|
path = os.path.join('foo', 'bar', 'baz', 'qux.py')
|
|
expect = os.path.join('foo', 'bar', 'baz', '__pycache__',
|
|
'qux.{}.pyo'.format(self.tag))
|
|
self.assertEqual(self.util.cache_from_source(path, False), expect)
|
|
|
|
def test_cache_from_source_cwd(self):
|
|
path = 'foo.py'
|
|
expect = os.path.join('__pycache__', 'foo.{}.pyc'.format(self.tag))
|
|
self.assertEqual(self.util.cache_from_source(path, True), expect)
|
|
|
|
def test_cache_from_source_override(self):
|
|
# When debug_override is not None, it can be any true-ish or false-ish
|
|
# value.
|
|
path = os.path.join('foo', 'bar', 'baz.py')
|
|
partial_expect = os.path.join('foo', 'bar', '__pycache__',
|
|
'baz.{}.py'.format(self.tag))
|
|
self.assertEqual(self.util.cache_from_source(path, []), partial_expect + 'o')
|
|
self.assertEqual(self.util.cache_from_source(path, [17]),
|
|
partial_expect + 'c')
|
|
# However if the bool-ishness can't be determined, the exception
|
|
# propagates.
|
|
class Bearish:
|
|
def __bool__(self): raise RuntimeError
|
|
with self.assertRaises(RuntimeError):
|
|
self.util.cache_from_source('/foo/bar/baz.py', Bearish())
|
|
|
|
@unittest.skipUnless(os.sep == '\\' and os.altsep == '/',
|
|
'test meaningful only where os.altsep is defined')
|
|
def test_sep_altsep_and_sep_cache_from_source(self):
|
|
# Windows path and PEP 3147 where sep is right of altsep.
|
|
self.assertEqual(
|
|
self.util.cache_from_source('\\foo\\bar\\baz/qux.py', True),
|
|
'\\foo\\bar\\baz\\__pycache__\\qux.{}.pyc'.format(self.tag))
|
|
|
|
@unittest.skipUnless(sys.implementation.cache_tag is not None,
|
|
'requires sys.implementation.cache_tag to not be '
|
|
'None')
|
|
def test_source_from_cache(self):
|
|
# Given the path to a PEP 3147 defined .pyc file, return the path to
|
|
# its source. This tests the good path.
|
|
path = os.path.join('foo', 'bar', 'baz', '__pycache__',
|
|
'qux.{}.pyc'.format(self.tag))
|
|
expect = os.path.join('foo', 'bar', 'baz', 'qux.py')
|
|
self.assertEqual(self.util.source_from_cache(path), expect)
|
|
|
|
def test_source_from_cache_no_cache_tag(self):
|
|
# If sys.implementation.cache_tag is None, raise NotImplementedError.
|
|
path = os.path.join('blah', '__pycache__', 'whatever.pyc')
|
|
with support.swap_attr(sys.implementation, 'cache_tag', None):
|
|
with self.assertRaises(NotImplementedError):
|
|
self.util.source_from_cache(path)
|
|
|
|
def test_source_from_cache_bad_path(self):
|
|
# When the path to a pyc file is not in PEP 3147 format, a ValueError
|
|
# is raised.
|
|
self.assertRaises(
|
|
ValueError, self.util.source_from_cache, '/foo/bar/bazqux.pyc')
|
|
|
|
def test_source_from_cache_no_slash(self):
|
|
# No slashes at all in path -> ValueError
|
|
self.assertRaises(
|
|
ValueError, self.util.source_from_cache, 'foo.cpython-32.pyc')
|
|
|
|
def test_source_from_cache_too_few_dots(self):
|
|
# Too few dots in final path component -> ValueError
|
|
self.assertRaises(
|
|
ValueError, self.util.source_from_cache, '__pycache__/foo.pyc')
|
|
|
|
def test_source_from_cache_too_many_dots(self):
|
|
# Too many dots in final path component -> ValueError
|
|
self.assertRaises(
|
|
ValueError, self.util.source_from_cache,
|
|
'__pycache__/foo.cpython-32.foo.pyc')
|
|
|
|
def test_source_from_cache_no__pycache__(self):
|
|
# Another problem with the path -> ValueError
|
|
self.assertRaises(
|
|
ValueError, self.util.source_from_cache,
|
|
'/foo/bar/foo.cpython-32.foo.pyc')
|
|
|
|
|
|
(Frozen_PEP3147Tests,
|
|
Source_PEP3147Tests
|
|
) = util.test_both(PEP3147Tests, util=importlib_util)
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main()
|