mirror of
https://github.com/python/cpython.git
synced 2025-11-03 19:34:08 +00:00
699 lines
24 KiB
Python
699 lines
24 KiB
Python
import functools
|
|
import collections
|
|
import sys
|
|
import unittest
|
|
from test import support
|
|
from weakref import proxy
|
|
import pickle
|
|
from random import choice
|
|
|
|
@staticmethod
|
|
def PythonPartial(func, *args, **keywords):
|
|
'Pure Python approximation of partial()'
|
|
def newfunc(*fargs, **fkeywords):
|
|
newkeywords = keywords.copy()
|
|
newkeywords.update(fkeywords)
|
|
return func(*(args + fargs), **newkeywords)
|
|
newfunc.func = func
|
|
newfunc.args = args
|
|
newfunc.keywords = keywords
|
|
return newfunc
|
|
|
|
def capture(*args, **kw):
|
|
"""capture all positional and keyword arguments"""
|
|
return args, kw
|
|
|
|
def signature(part):
|
|
""" return the signature of a partial object """
|
|
return (part.func, part.args, part.keywords, part.__dict__)
|
|
|
|
class TestPartial(unittest.TestCase):
|
|
|
|
thetype = functools.partial
|
|
|
|
def test_basic_examples(self):
|
|
p = self.thetype(capture, 1, 2, a=10, b=20)
|
|
self.assertEqual(p(3, 4, b=30, c=40),
|
|
((1, 2, 3, 4), dict(a=10, b=30, c=40)))
|
|
p = self.thetype(map, lambda x: x*10)
|
|
self.assertEqual(list(p([1,2,3,4])), [10, 20, 30, 40])
|
|
|
|
def test_attributes(self):
|
|
p = self.thetype(capture, 1, 2, a=10, b=20)
|
|
# attributes should be readable
|
|
self.assertEqual(p.func, capture)
|
|
self.assertEqual(p.args, (1, 2))
|
|
self.assertEqual(p.keywords, dict(a=10, b=20))
|
|
# attributes should not be writable
|
|
if not isinstance(self.thetype, type):
|
|
return
|
|
self.assertRaises(AttributeError, setattr, p, 'func', map)
|
|
self.assertRaises(AttributeError, setattr, p, 'args', (1, 2))
|
|
self.assertRaises(AttributeError, setattr, p, 'keywords', dict(a=1, b=2))
|
|
|
|
p = self.thetype(hex)
|
|
try:
|
|
del p.__dict__
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail('partial object allowed __dict__ to be deleted')
|
|
|
|
def test_argument_checking(self):
|
|
self.assertRaises(TypeError, self.thetype) # need at least a func arg
|
|
try:
|
|
self.thetype(2)()
|
|
except TypeError:
|
|
pass
|
|
else:
|
|
self.fail('First arg not checked for callability')
|
|
|
|
def test_protection_of_callers_dict_argument(self):
|
|
# a caller's dictionary should not be altered by partial
|
|
def func(a=10, b=20):
|
|
return a
|
|
d = {'a':3}
|
|
p = self.thetype(func, a=5)
|
|
self.assertEqual(p(**d), 3)
|
|
self.assertEqual(d, {'a':3})
|
|
p(b=7)
|
|
self.assertEqual(d, {'a':3})
|
|
|
|
def test_arg_combinations(self):
|
|
# exercise special code paths for zero args in either partial
|
|
# object or the caller
|
|
p = self.thetype(capture)
|
|
self.assertEqual(p(), ((), {}))
|
|
self.assertEqual(p(1,2), ((1,2), {}))
|
|
p = self.thetype(capture, 1, 2)
|
|
self.assertEqual(p(), ((1,2), {}))
|
|
self.assertEqual(p(3,4), ((1,2,3,4), {}))
|
|
|
|
def test_kw_combinations(self):
|
|
# exercise special code paths for no keyword args in
|
|
# either the partial object or the caller
|
|
p = self.thetype(capture)
|
|
self.assertEqual(p(), ((), {}))
|
|
self.assertEqual(p(a=1), ((), {'a':1}))
|
|
p = self.thetype(capture, a=1)
|
|
self.assertEqual(p(), ((), {'a':1}))
|
|
self.assertEqual(p(b=2), ((), {'a':1, 'b':2}))
|
|
# keyword args in the call override those in the partial object
|
|
self.assertEqual(p(a=3, b=2), ((), {'a':3, 'b':2}))
|
|
|
|
def test_positional(self):
|
|
# make sure positional arguments are captured correctly
|
|
for args in [(), (0,), (0,1), (0,1,2), (0,1,2,3)]:
|
|
p = self.thetype(capture, *args)
|
|
expected = args + ('x',)
|
|
got, empty = p('x')
|
|
self.assertTrue(expected == got and empty == {})
|
|
|
|
def test_keyword(self):
|
|
# make sure keyword arguments are captured correctly
|
|
for a in ['a', 0, None, 3.5]:
|
|
p = self.thetype(capture, a=a)
|
|
expected = {'a':a,'x':None}
|
|
empty, got = p(x=None)
|
|
self.assertTrue(expected == got and empty == ())
|
|
|
|
def test_no_side_effects(self):
|
|
# make sure there are no side effects that affect subsequent calls
|
|
p = self.thetype(capture, 0, a=1)
|
|
args1, kw1 = p(1, b=2)
|
|
self.assertTrue(args1 == (0,1) and kw1 == {'a':1,'b':2})
|
|
args2, kw2 = p()
|
|
self.assertTrue(args2 == (0,) and kw2 == {'a':1})
|
|
|
|
def test_error_propagation(self):
|
|
def f(x, y):
|
|
x / y
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f, 1, 0))
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f, 1), 0)
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f), 1, 0)
|
|
self.assertRaises(ZeroDivisionError, self.thetype(f, y=0), 1)
|
|
|
|
def test_weakref(self):
|
|
f = self.thetype(int, base=16)
|
|
p = proxy(f)
|
|
self.assertEqual(f.func, p.func)
|
|
f = None
|
|
self.assertRaises(ReferenceError, getattr, p, 'func')
|
|
|
|
def test_with_bound_and_unbound_methods(self):
|
|
data = list(map(str, range(10)))
|
|
join = self.thetype(str.join, '')
|
|
self.assertEqual(join(data), '0123456789')
|
|
join = self.thetype(''.join)
|
|
self.assertEqual(join(data), '0123456789')
|
|
|
|
def test_repr(self):
|
|
args = (object(), object())
|
|
args_repr = ', '.join(repr(a) for a in args)
|
|
kwargs = {'a': object(), 'b': object()}
|
|
kwargs_repr = ', '.join("%s=%r" % (k, v) for k, v in kwargs.items())
|
|
if self.thetype is functools.partial:
|
|
name = 'functools.partial'
|
|
else:
|
|
name = self.thetype.__name__
|
|
|
|
f = self.thetype(capture)
|
|
self.assertEqual('{}({!r})'.format(name, capture),
|
|
repr(f))
|
|
|
|
f = self.thetype(capture, *args)
|
|
self.assertEqual('{}({!r}, {})'.format(name, capture, args_repr),
|
|
repr(f))
|
|
|
|
f = self.thetype(capture, **kwargs)
|
|
self.assertEqual('{}({!r}, {})'.format(name, capture, kwargs_repr),
|
|
repr(f))
|
|
|
|
f = self.thetype(capture, *args, **kwargs)
|
|
self.assertEqual('{}({!r}, {}, {})'.format(name, capture, args_repr, kwargs_repr),
|
|
repr(f))
|
|
|
|
def test_pickle(self):
|
|
f = self.thetype(signature, 'asdf', bar=True)
|
|
f.add_something_to__dict__ = True
|
|
f_copy = pickle.loads(pickle.dumps(f))
|
|
self.assertEqual(signature(f), signature(f_copy))
|
|
|
|
class PartialSubclass(functools.partial):
|
|
pass
|
|
|
|
class TestPartialSubclass(TestPartial):
|
|
|
|
thetype = PartialSubclass
|
|
|
|
class TestPythonPartial(TestPartial):
|
|
|
|
thetype = PythonPartial
|
|
|
|
# the python version hasn't a nice repr
|
|
def test_repr(self): pass
|
|
|
|
# the python version isn't picklable
|
|
def test_pickle(self): pass
|
|
|
|
class TestUpdateWrapper(unittest.TestCase):
|
|
|
|
def check_wrapper(self, wrapper, wrapped,
|
|
assigned=functools.WRAPPER_ASSIGNMENTS,
|
|
updated=functools.WRAPPER_UPDATES):
|
|
# Check attributes were assigned
|
|
for name in assigned:
|
|
self.assertTrue(getattr(wrapper, name) is getattr(wrapped, name))
|
|
# Check attributes were updated
|
|
for name in updated:
|
|
wrapper_attr = getattr(wrapper, name)
|
|
wrapped_attr = getattr(wrapped, name)
|
|
for key in wrapped_attr:
|
|
self.assertTrue(wrapped_attr[key] is wrapper_attr[key])
|
|
|
|
def _default_update(self):
|
|
def f(a:'This is a new annotation'):
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
def wrapper(b:'This is the prior annotation'):
|
|
pass
|
|
functools.update_wrapper(wrapper, f)
|
|
return wrapper, f
|
|
|
|
def test_default_update(self):
|
|
wrapper, f = self._default_update()
|
|
self.check_wrapper(wrapper, f)
|
|
self.assertIs(wrapper.__wrapped__, f)
|
|
self.assertEqual(wrapper.__name__, 'f')
|
|
self.assertEqual(wrapper.attr, 'This is also a test')
|
|
self.assertEqual(wrapper.__annotations__['a'], 'This is a new annotation')
|
|
self.assertNotIn('b', wrapper.__annotations__)
|
|
|
|
@unittest.skipIf(sys.flags.optimize >= 2,
|
|
"Docstrings are omitted with -O2 and above")
|
|
def test_default_update_doc(self):
|
|
wrapper, f = self._default_update()
|
|
self.assertEqual(wrapper.__doc__, 'This is a test')
|
|
|
|
def test_no_update(self):
|
|
def f():
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
def wrapper():
|
|
pass
|
|
functools.update_wrapper(wrapper, f, (), ())
|
|
self.check_wrapper(wrapper, f, (), ())
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.assertEqual(wrapper.__annotations__, {})
|
|
self.assertFalse(hasattr(wrapper, 'attr'))
|
|
|
|
def test_selective_update(self):
|
|
def f():
|
|
pass
|
|
f.attr = 'This is a different test'
|
|
f.dict_attr = dict(a=1, b=2, c=3)
|
|
def wrapper():
|
|
pass
|
|
wrapper.dict_attr = {}
|
|
assign = ('attr',)
|
|
update = ('dict_attr',)
|
|
functools.update_wrapper(wrapper, f, assign, update)
|
|
self.check_wrapper(wrapper, f, assign, update)
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.assertEqual(wrapper.attr, 'This is a different test')
|
|
self.assertEqual(wrapper.dict_attr, f.dict_attr)
|
|
|
|
def test_missing_attributes(self):
|
|
def f():
|
|
pass
|
|
def wrapper():
|
|
pass
|
|
wrapper.dict_attr = {}
|
|
assign = ('attr',)
|
|
update = ('dict_attr',)
|
|
# Missing attributes on wrapped object are ignored
|
|
functools.update_wrapper(wrapper, f, assign, update)
|
|
self.assertNotIn('attr', wrapper.__dict__)
|
|
self.assertEqual(wrapper.dict_attr, {})
|
|
# Wrapper must have expected attributes for updating
|
|
del wrapper.dict_attr
|
|
with self.assertRaises(AttributeError):
|
|
functools.update_wrapper(wrapper, f, assign, update)
|
|
wrapper.dict_attr = 1
|
|
with self.assertRaises(AttributeError):
|
|
functools.update_wrapper(wrapper, f, assign, update)
|
|
|
|
@unittest.skipIf(sys.flags.optimize >= 2,
|
|
"Docstrings are omitted with -O2 and above")
|
|
def test_builtin_update(self):
|
|
# Test for bug #1576241
|
|
def wrapper():
|
|
pass
|
|
functools.update_wrapper(wrapper, max)
|
|
self.assertEqual(wrapper.__name__, 'max')
|
|
self.assertTrue(wrapper.__doc__.startswith('max('))
|
|
self.assertEqual(wrapper.__annotations__, {})
|
|
|
|
class TestWraps(TestUpdateWrapper):
|
|
|
|
def _default_update(self):
|
|
def f():
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
@functools.wraps(f)
|
|
def wrapper():
|
|
pass
|
|
self.check_wrapper(wrapper, f)
|
|
return wrapper
|
|
|
|
def test_default_update(self):
|
|
wrapper = self._default_update()
|
|
self.assertEqual(wrapper.__name__, 'f')
|
|
self.assertEqual(wrapper.attr, 'This is also a test')
|
|
|
|
@unittest.skipIf(not sys.flags.optimize <= 1,
|
|
"Docstrings are omitted with -O2 and above")
|
|
def test_default_update_doc(self):
|
|
wrapper = self._default_update()
|
|
self.assertEqual(wrapper.__doc__, 'This is a test')
|
|
|
|
def test_no_update(self):
|
|
def f():
|
|
"""This is a test"""
|
|
pass
|
|
f.attr = 'This is also a test'
|
|
@functools.wraps(f, (), ())
|
|
def wrapper():
|
|
pass
|
|
self.check_wrapper(wrapper, f, (), ())
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.assertFalse(hasattr(wrapper, 'attr'))
|
|
|
|
def test_selective_update(self):
|
|
def f():
|
|
pass
|
|
f.attr = 'This is a different test'
|
|
f.dict_attr = dict(a=1, b=2, c=3)
|
|
def add_dict_attr(f):
|
|
f.dict_attr = {}
|
|
return f
|
|
assign = ('attr',)
|
|
update = ('dict_attr',)
|
|
@functools.wraps(f, assign, update)
|
|
@add_dict_attr
|
|
def wrapper():
|
|
pass
|
|
self.check_wrapper(wrapper, f, assign, update)
|
|
self.assertEqual(wrapper.__name__, 'wrapper')
|
|
self.assertEqual(wrapper.__doc__, None)
|
|
self.assertEqual(wrapper.attr, 'This is a different test')
|
|
self.assertEqual(wrapper.dict_attr, f.dict_attr)
|
|
|
|
class TestReduce(unittest.TestCase):
|
|
func = functools.reduce
|
|
|
|
def test_reduce(self):
|
|
class Squares:
|
|
def __init__(self, max):
|
|
self.max = max
|
|
self.sofar = []
|
|
|
|
def __len__(self):
|
|
return len(self.sofar)
|
|
|
|
def __getitem__(self, i):
|
|
if not 0 <= i < self.max: raise IndexError
|
|
n = len(self.sofar)
|
|
while n <= i:
|
|
self.sofar.append(n*n)
|
|
n += 1
|
|
return self.sofar[i]
|
|
def add(x, y):
|
|
return x + y
|
|
self.assertEqual(self.func(add, ['a', 'b', 'c'], ''), 'abc')
|
|
self.assertEqual(
|
|
self.func(add, [['a', 'c'], [], ['d', 'w']], []),
|
|
['a','c','d','w']
|
|
)
|
|
self.assertEqual(self.func(lambda x, y: x*y, range(2,8), 1), 5040)
|
|
self.assertEqual(
|
|
self.func(lambda x, y: x*y, range(2,21), 1),
|
|
2432902008176640000
|
|
)
|
|
self.assertEqual(self.func(add, Squares(10)), 285)
|
|
self.assertEqual(self.func(add, Squares(10), 0), 285)
|
|
self.assertEqual(self.func(add, Squares(0), 0), 0)
|
|
self.assertRaises(TypeError, self.func)
|
|
self.assertRaises(TypeError, self.func, 42, 42)
|
|
self.assertRaises(TypeError, self.func, 42, 42, 42)
|
|
self.assertEqual(self.func(42, "1"), "1") # func is never called with one item
|
|
self.assertEqual(self.func(42, "", "1"), "1") # func is never called with one item
|
|
self.assertRaises(TypeError, self.func, 42, (42, 42))
|
|
self.assertRaises(TypeError, self.func, add, []) # arg 2 must not be empty sequence with no initial value
|
|
self.assertRaises(TypeError, self.func, add, "")
|
|
self.assertRaises(TypeError, self.func, add, ())
|
|
self.assertRaises(TypeError, self.func, add, object())
|
|
|
|
class TestFailingIter:
|
|
def __iter__(self):
|
|
raise RuntimeError
|
|
self.assertRaises(RuntimeError, self.func, add, TestFailingIter())
|
|
|
|
self.assertEqual(self.func(add, [], None), None)
|
|
self.assertEqual(self.func(add, [], 42), 42)
|
|
|
|
class BadSeq:
|
|
def __getitem__(self, index):
|
|
raise ValueError
|
|
self.assertRaises(ValueError, self.func, 42, BadSeq())
|
|
|
|
# Test reduce()'s use of iterators.
|
|
def test_iterator_usage(self):
|
|
class SequenceClass:
|
|
def __init__(self, n):
|
|
self.n = n
|
|
def __getitem__(self, i):
|
|
if 0 <= i < self.n:
|
|
return i
|
|
else:
|
|
raise IndexError
|
|
|
|
from operator import add
|
|
self.assertEqual(self.func(add, SequenceClass(5)), 10)
|
|
self.assertEqual(self.func(add, SequenceClass(5), 42), 52)
|
|
self.assertRaises(TypeError, self.func, add, SequenceClass(0))
|
|
self.assertEqual(self.func(add, SequenceClass(0), 42), 42)
|
|
self.assertEqual(self.func(add, SequenceClass(1)), 0)
|
|
self.assertEqual(self.func(add, SequenceClass(1), 42), 42)
|
|
|
|
d = {"one": 1, "two": 2, "three": 3}
|
|
self.assertEqual(self.func(add, d), "".join(d.keys()))
|
|
|
|
class TestCmpToKey(unittest.TestCase):
|
|
def test_cmp_to_key(self):
|
|
def mycmp(x, y):
|
|
return y - x
|
|
self.assertEqual(sorted(range(5), key=functools.cmp_to_key(mycmp)),
|
|
[4, 3, 2, 1, 0])
|
|
|
|
def test_hash(self):
|
|
def mycmp(x, y):
|
|
return y - x
|
|
key = functools.cmp_to_key(mycmp)
|
|
k = key(10)
|
|
self.assertRaises(TypeError, hash, k)
|
|
self.assertFalse(isinstance(k, collections.Hashable))
|
|
|
|
class TestTotalOrdering(unittest.TestCase):
|
|
|
|
def test_total_ordering_lt(self):
|
|
@functools.total_ordering
|
|
class A:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
def __lt__(self, other):
|
|
return self.value < other.value
|
|
def __eq__(self, other):
|
|
return self.value == other.value
|
|
self.assertTrue(A(1) < A(2))
|
|
self.assertTrue(A(2) > A(1))
|
|
self.assertTrue(A(1) <= A(2))
|
|
self.assertTrue(A(2) >= A(1))
|
|
self.assertTrue(A(2) <= A(2))
|
|
self.assertTrue(A(2) >= A(2))
|
|
|
|
def test_total_ordering_le(self):
|
|
@functools.total_ordering
|
|
class A:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
def __le__(self, other):
|
|
return self.value <= other.value
|
|
def __eq__(self, other):
|
|
return self.value == other.value
|
|
self.assertTrue(A(1) < A(2))
|
|
self.assertTrue(A(2) > A(1))
|
|
self.assertTrue(A(1) <= A(2))
|
|
self.assertTrue(A(2) >= A(1))
|
|
self.assertTrue(A(2) <= A(2))
|
|
self.assertTrue(A(2) >= A(2))
|
|
|
|
def test_total_ordering_gt(self):
|
|
@functools.total_ordering
|
|
class A:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
def __gt__(self, other):
|
|
return self.value > other.value
|
|
def __eq__(self, other):
|
|
return self.value == other.value
|
|
self.assertTrue(A(1) < A(2))
|
|
self.assertTrue(A(2) > A(1))
|
|
self.assertTrue(A(1) <= A(2))
|
|
self.assertTrue(A(2) >= A(1))
|
|
self.assertTrue(A(2) <= A(2))
|
|
self.assertTrue(A(2) >= A(2))
|
|
|
|
def test_total_ordering_ge(self):
|
|
@functools.total_ordering
|
|
class A:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
def __ge__(self, other):
|
|
return self.value >= other.value
|
|
def __eq__(self, other):
|
|
return self.value == other.value
|
|
self.assertTrue(A(1) < A(2))
|
|
self.assertTrue(A(2) > A(1))
|
|
self.assertTrue(A(1) <= A(2))
|
|
self.assertTrue(A(2) >= A(1))
|
|
self.assertTrue(A(2) <= A(2))
|
|
self.assertTrue(A(2) >= A(2))
|
|
|
|
def test_total_ordering_no_overwrite(self):
|
|
# new methods should not overwrite existing
|
|
@functools.total_ordering
|
|
class A(int):
|
|
pass
|
|
self.assertTrue(A(1) < A(2))
|
|
self.assertTrue(A(2) > A(1))
|
|
self.assertTrue(A(1) <= A(2))
|
|
self.assertTrue(A(2) >= A(1))
|
|
self.assertTrue(A(2) <= A(2))
|
|
self.assertTrue(A(2) >= A(2))
|
|
|
|
def test_no_operations_defined(self):
|
|
with self.assertRaises(ValueError):
|
|
@functools.total_ordering
|
|
class A:
|
|
pass
|
|
|
|
def test_bug_10042(self):
|
|
@functools.total_ordering
|
|
class TestTO:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
def __eq__(self, other):
|
|
if isinstance(other, TestTO):
|
|
return self.value == other.value
|
|
return False
|
|
def __lt__(self, other):
|
|
if isinstance(other, TestTO):
|
|
return self.value < other.value
|
|
raise TypeError
|
|
with self.assertRaises(TypeError):
|
|
TestTO(8) <= ()
|
|
|
|
class TestLRU(unittest.TestCase):
|
|
|
|
def test_lru(self):
|
|
def orig(x, y):
|
|
return 3*x+y
|
|
f = functools.lru_cache(maxsize=20)(orig)
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertEqual(maxsize, 20)
|
|
self.assertEqual(currsize, 0)
|
|
self.assertEqual(hits, 0)
|
|
self.assertEqual(misses, 0)
|
|
|
|
domain = range(5)
|
|
for i in range(1000):
|
|
x, y = choice(domain), choice(domain)
|
|
actual = f(x, y)
|
|
expected = orig(x, y)
|
|
self.assertEqual(actual, expected)
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertTrue(hits > misses)
|
|
self.assertEqual(hits + misses, 1000)
|
|
self.assertEqual(currsize, 20)
|
|
|
|
f.cache_clear() # test clearing
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertEqual(hits, 0)
|
|
self.assertEqual(misses, 0)
|
|
self.assertEqual(currsize, 0)
|
|
f(x, y)
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertEqual(hits, 0)
|
|
self.assertEqual(misses, 1)
|
|
self.assertEqual(currsize, 1)
|
|
|
|
# Test bypassing the cache
|
|
self.assertIs(f.__wrapped__, orig)
|
|
f.__wrapped__(x, y)
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertEqual(hits, 0)
|
|
self.assertEqual(misses, 1)
|
|
self.assertEqual(currsize, 1)
|
|
|
|
# test size zero (which means "never-cache")
|
|
@functools.lru_cache(0)
|
|
def f():
|
|
nonlocal f_cnt
|
|
f_cnt += 1
|
|
return 20
|
|
self.assertEqual(f.cache_info().maxsize, 0)
|
|
f_cnt = 0
|
|
for i in range(5):
|
|
self.assertEqual(f(), 20)
|
|
self.assertEqual(f_cnt, 5)
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertEqual(hits, 0)
|
|
self.assertEqual(misses, 5)
|
|
self.assertEqual(currsize, 0)
|
|
|
|
# test size one
|
|
@functools.lru_cache(1)
|
|
def f():
|
|
nonlocal f_cnt
|
|
f_cnt += 1
|
|
return 20
|
|
self.assertEqual(f.cache_info().maxsize, 1)
|
|
f_cnt = 0
|
|
for i in range(5):
|
|
self.assertEqual(f(), 20)
|
|
self.assertEqual(f_cnt, 1)
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertEqual(hits, 4)
|
|
self.assertEqual(misses, 1)
|
|
self.assertEqual(currsize, 1)
|
|
|
|
# test size two
|
|
@functools.lru_cache(2)
|
|
def f(x):
|
|
nonlocal f_cnt
|
|
f_cnt += 1
|
|
return x*10
|
|
self.assertEqual(f.cache_info().maxsize, 2)
|
|
f_cnt = 0
|
|
for x in 7, 9, 7, 9, 7, 9, 8, 8, 8, 9, 9, 9, 8, 8, 8, 7:
|
|
# * * * *
|
|
self.assertEqual(f(x), x*10)
|
|
self.assertEqual(f_cnt, 4)
|
|
hits, misses, maxsize, currsize = f.cache_info()
|
|
self.assertEqual(hits, 12)
|
|
self.assertEqual(misses, 4)
|
|
self.assertEqual(currsize, 2)
|
|
|
|
def test_lru_with_maxsize_none(self):
|
|
@functools.lru_cache(maxsize=None)
|
|
def fib(n):
|
|
if n < 2:
|
|
return n
|
|
return fib(n-1) + fib(n-2)
|
|
self.assertEqual([fib(n) for n in range(16)],
|
|
[0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610])
|
|
self.assertEqual(fib.cache_info(),
|
|
functools._CacheInfo(hits=28, misses=16, maxsize=None, currsize=16))
|
|
fib.cache_clear()
|
|
self.assertEqual(fib.cache_info(),
|
|
functools._CacheInfo(hits=0, misses=0, maxsize=None, currsize=0))
|
|
|
|
def test_lru_with_exceptions(self):
|
|
# Verify that user_function exceptions get passed through without
|
|
# creating a hard-to-read chained exception.
|
|
# http://bugs.python.org/issue13177
|
|
for maxsize in (None, 100):
|
|
@functools.lru_cache(maxsize)
|
|
def func(i):
|
|
return 'abc'[i]
|
|
self.assertEqual(func(0), 'a')
|
|
with self.assertRaises(IndexError) as cm:
|
|
func(15)
|
|
self.assertIsNone(cm.exception.__context__)
|
|
# Verify that the previous exception did not result in a cached entry
|
|
with self.assertRaises(IndexError):
|
|
func(15)
|
|
|
|
def test_main(verbose=None):
|
|
test_classes = (
|
|
TestPartial,
|
|
TestPartialSubclass,
|
|
TestPythonPartial,
|
|
TestUpdateWrapper,
|
|
TestTotalOrdering,
|
|
TestCmpToKey,
|
|
TestWraps,
|
|
TestReduce,
|
|
TestLRU,
|
|
)
|
|
support.run_unittest(*test_classes)
|
|
|
|
# verify reference counting
|
|
if verbose and hasattr(sys, "gettotalrefcount"):
|
|
import gc
|
|
counts = [None] * 5
|
|
for i in range(len(counts)):
|
|
support.run_unittest(*test_classes)
|
|
gc.collect()
|
|
counts[i] = sys.gettotalrefcount()
|
|
print(counts)
|
|
|
|
if __name__ == '__main__':
|
|
test_main(verbose=True)
|