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svn+ssh://pythondev@svn.python.org/python/trunk ........ r79060 | collin.winter | 2010-03-18 14:54:01 -0700 (Thu, 18 Mar 2010) | 4 lines Add support for weak references to code objects. This will be used by an optimization in the incoming Python 3 JIT. Patch by Reid Kleckner! ........
169 lines
3.5 KiB
Python
169 lines
3.5 KiB
Python
"""This module includes tests of the code object representation.
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>>> def f(x):
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... def g(y):
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... return x + y
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... return g
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...
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>>> dump(f.__code__)
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name: f
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argcount: 1
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kwonlyargcount: 0
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names: ()
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varnames: ('x', 'g')
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cellvars: ('x',)
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freevars: ()
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nlocals: 2
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flags: 3
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consts: ('None', '<code object g>')
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>>> dump(f(4).__code__)
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name: g
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argcount: 1
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kwonlyargcount: 0
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names: ()
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varnames: ('y',)
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cellvars: ()
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freevars: ('x',)
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nlocals: 1
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flags: 19
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consts: ('None',)
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>>> def h(x, y):
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... a = x + y
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... b = x - y
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... c = a * b
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... return c
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...
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>>> dump(h.__code__)
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name: h
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argcount: 2
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kwonlyargcount: 0
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names: ()
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varnames: ('x', 'y', 'a', 'b', 'c')
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cellvars: ()
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freevars: ()
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nlocals: 5
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flags: 67
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consts: ('None',)
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>>> def attrs(obj):
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... print(obj.attr1)
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... print(obj.attr2)
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... print(obj.attr3)
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>>> dump(attrs.__code__)
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name: attrs
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argcount: 1
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kwonlyargcount: 0
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names: ('print', 'attr1', 'attr2', 'attr3')
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varnames: ('obj',)
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cellvars: ()
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freevars: ()
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nlocals: 1
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flags: 67
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consts: ('None',)
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>>> def optimize_away():
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... 'doc string'
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... 'not a docstring'
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... 53
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... 0x53
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>>> dump(optimize_away.__code__)
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name: optimize_away
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argcount: 0
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kwonlyargcount: 0
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names: ()
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varnames: ()
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cellvars: ()
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freevars: ()
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nlocals: 0
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flags: 67
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consts: ("'doc string'", 'None')
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>>> def keywordonly_args(a,b,*,k1):
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... return a,b,k1
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...
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>>> dump(keywordonly_args.__code__)
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name: keywordonly_args
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argcount: 2
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kwonlyargcount: 1
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names: ()
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varnames: ('a', 'b', 'k1')
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cellvars: ()
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freevars: ()
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nlocals: 3
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flags: 67
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consts: ('None',)
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"""
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import unittest
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import weakref
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import _testcapi
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def consts(t):
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"""Yield a doctest-safe sequence of object reprs."""
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for elt in t:
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r = repr(elt)
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if r.startswith("<code object"):
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yield "<code object %s>" % elt.co_name
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else:
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yield r
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def dump(co):
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"""Print out a text representation of a code object."""
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for attr in ["name", "argcount", "kwonlyargcount", "names", "varnames",
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"cellvars", "freevars", "nlocals", "flags"]:
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print("%s: %s" % (attr, getattr(co, "co_" + attr)))
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print("consts:", tuple(consts(co.co_consts)))
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class CodeTest(unittest.TestCase):
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def test_newempty(self):
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co = _testcapi.code_newempty("filename", "funcname", 15)
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self.assertEquals(co.co_filename, "filename")
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self.assertEquals(co.co_name, "funcname")
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self.assertEquals(co.co_firstlineno, 15)
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class CodeWeakRefTest(unittest.TestCase):
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def test_basic(self):
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# Create a code object in a clean environment so that we know we have
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# the only reference to it left.
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namespace = {}
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exec("def f(): pass", globals(), namespace)
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f = namespace["f"]
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del namespace
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self.called = False
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def callback(code):
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self.called = True
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# f is now the last reference to the function, and through it, the code
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# object. While we hold it, check that we can create a weakref and
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# deref it. Then delete it, and check that the callback gets called and
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# the reference dies.
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coderef = weakref.ref(f.__code__, callback)
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self.assertTrue(bool(coderef()))
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del f
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self.assertFalse(bool(coderef()))
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self.assertTrue(self.called)
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def test_main(verbose=None):
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from test.support import run_doctest, run_unittest
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from test import test_code
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run_doctest(test_code, verbose)
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run_unittest(CodeTest, CodeWeakRefTest)
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if __name__ == "__main__":
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test_main()
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