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Copy pathtest_functools.py
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3196 lines (2768 loc) · 113 KB
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import abc
import builtins
import collections
import collections.abc
import copy
from itertools import permutations
import pickle
from random import choice
import sys
from test import support
import threading
import time
import typing
import unittest
import unittest.mock
import weakref
import gc
from weakref import proxy
import contextlib
from inspect import Signature
from test.support import import_helper
from test.support import threading_helper
import functools
py_functools = import_helper.import_fresh_module('functools',
blocked=['_functools'])
c_functools = import_helper.import_fresh_module('functools',
fresh=['_functools'])
decimal = import_helper.import_fresh_module('decimal', fresh=['_decimal'])
@contextlib.contextmanager
def replaced_module(name, replacement):
original_module = sys.modules[name]
sys.modules[name] = replacement
try:
yield
finally:
sys.modules[name] = original_module
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 MyTuple(tuple):
pass
class BadTuple(tuple):
def __add__(self, other):
return list(self) + list(other)
class MyDict(dict):
pass
class TestPartial:
def test_basic_examples(self):
p = self.partial(capture, 1, 2, a=10, b=20)
self.assertTrue(callable(p))
self.assertEqual(p(3, 4, b=30, c=40),
((1, 2, 3, 4), dict(a=10, b=30, c=40)))
p = self.partial(map, lambda x: x*10)
self.assertEqual(list(p([1,2,3,4])), [10, 20, 30, 40])
def test_attributes(self):
p = self.partial(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))
def test_argument_checking(self):
self.assertRaises(TypeError, self.partial) # need at least a func arg
try:
self.partial(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.partial(func, a=5)
self.assertEqual(p(**d), 3)
self.assertEqual(d, {'a':3})
p(b=7)
self.assertEqual(d, {'a':3})
def test_kwargs_copy(self):
# Issue #29532: Altering a kwarg dictionary passed to a constructor
# should not affect a partial object after creation
d = {'a': 3}
p = self.partial(capture, **d)
self.assertEqual(p(), ((), {'a': 3}))
d['a'] = 5
self.assertEqual(p(), ((), {'a': 3}))
def test_arg_combinations(self):
# exercise special code paths for zero args in either partial
# object or the caller
p = self.partial(capture)
self.assertEqual(p(), ((), {}))
self.assertEqual(p(1,2), ((1,2), {}))
p = self.partial(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.partial(capture)
self.assertEqual(p.keywords, {})
self.assertEqual(p(), ((), {}))
self.assertEqual(p(a=1), ((), {'a':1}))
p = self.partial(capture, a=1)
self.assertEqual(p.keywords, {'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.partial(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.partial(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.partial(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.partial(f, 1, 0))
self.assertRaises(ZeroDivisionError, self.partial(f, 1), 0)
self.assertRaises(ZeroDivisionError, self.partial(f), 1, 0)
self.assertRaises(ZeroDivisionError, self.partial(f, y=0), 1)
def test_weakref(self):
f = self.partial(int, base=16)
p = proxy(f)
self.assertEqual(f.func, p.func)
f = None
support.gc_collect() # For PyPy or other GCs.
self.assertRaises(ReferenceError, getattr, p, 'func')
def test_with_bound_and_unbound_methods(self):
data = list(map(str, range(10)))
join = self.partial(str.join, '')
self.assertEqual(join(data), '0123456789')
join = self.partial(''.join)
self.assertEqual(join(data), '0123456789')
def test_nested_optimization(self):
partial = self.partial
inner = partial(signature, 'asdf')
nested = partial(inner, bar=True)
flat = partial(signature, 'asdf', bar=True)
self.assertEqual(signature(nested), signature(flat))
def test_nested_optimization_bug(self):
partial = self.partial
class Builder:
def __call__(self, tag, *children, **attrib):
return (tag, children, attrib)
def __getattr__(self, tag):
return partial(self, tag)
B = Builder()
m = B.m
assert m(1, 2, a=2) == ('m', (1, 2), dict(a=2))
def test_nested_partial_with_attribute(self):
# see issue 25137
partial = self.partial
def foo(bar):
return bar
p = partial(foo, 'first')
p2 = partial(p, 'second')
p2.new_attr = 'spam'
self.assertEqual(p2.new_attr, 'spam')
def test_repr(self):
args = (object(), object())
args_repr = ', '.join(repr(a) for a in args)
kwargs = {'a': object(), 'b': object()}
kwargs_reprs = ['a={a!r}, b={b!r}'.format_map(kwargs),
'b={b!r}, a={a!r}'.format_map(kwargs)]
name = f"{self.partial.__module__}.{self.partial.__qualname__}"
f = self.partial(capture)
self.assertEqual(f'{name}({capture!r})', repr(f))
f = self.partial(capture, *args)
self.assertEqual(f'{name}({capture!r}, {args_repr})', repr(f))
f = self.partial(capture, **kwargs)
self.assertIn(repr(f),
[f'{name}({capture!r}, {kwargs_repr})'
for kwargs_repr in kwargs_reprs])
f = self.partial(capture, *args, **kwargs)
self.assertIn(repr(f),
[f'{name}({capture!r}, {args_repr}, {kwargs_repr})'
for kwargs_repr in kwargs_reprs])
def test_recursive_repr(self):
name = f"{self.partial.__module__}.{self.partial.__qualname__}"
f = self.partial(capture)
f.__setstate__((f, (), {}, {}))
try:
self.assertEqual(repr(f), '%s(...)' % (name,))
finally:
f.__setstate__((capture, (), {}, {}))
f = self.partial(capture)
f.__setstate__((capture, (f,), {}, {}))
try:
self.assertEqual(repr(f), '%s(%r, ...)' % (name, capture,))
finally:
f.__setstate__((capture, (), {}, {}))
f = self.partial(capture)
f.__setstate__((capture, (), {'a': f}, {}))
try:
self.assertEqual(repr(f), '%s(%r, a=...)' % (name, capture,))
finally:
f.__setstate__((capture, (), {}, {}))
def test_pickle(self):
with replaced_module('functools', self.module):
f = self.partial(signature, ['asdf'], bar=[True])
f.attr = []
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
f_copy = pickle.loads(pickle.dumps(f, proto))
self.assertEqual(signature(f_copy), signature(f))
def test_copy(self):
f = self.partial(signature, ['asdf'], bar=[True])
f.attr = []
f_copy = copy.copy(f)
self.assertEqual(signature(f_copy), signature(f))
self.assertIs(f_copy.attr, f.attr)
self.assertIs(f_copy.args, f.args)
self.assertIs(f_copy.keywords, f.keywords)
def test_deepcopy(self):
f = self.partial(signature, ['asdf'], bar=[True])
f.attr = []
f_copy = copy.deepcopy(f)
self.assertEqual(signature(f_copy), signature(f))
self.assertIsNot(f_copy.attr, f.attr)
self.assertIsNot(f_copy.args, f.args)
self.assertIsNot(f_copy.args[0], f.args[0])
self.assertIsNot(f_copy.keywords, f.keywords)
self.assertIsNot(f_copy.keywords['bar'], f.keywords['bar'])
def test_setstate(self):
f = self.partial(signature)
f.__setstate__((capture, (1,), dict(a=10), dict(attr=[])))
self.assertEqual(signature(f),
(capture, (1,), dict(a=10), dict(attr=[])))
self.assertEqual(f(2, b=20), ((1, 2), {'a': 10, 'b': 20}))
f.__setstate__((capture, (1,), dict(a=10), None))
self.assertEqual(signature(f), (capture, (1,), dict(a=10), {}))
self.assertEqual(f(2, b=20), ((1, 2), {'a': 10, 'b': 20}))
f.__setstate__((capture, (1,), None, None))
#self.assertEqual(signature(f), (capture, (1,), {}, {}))
self.assertEqual(f(2, b=20), ((1, 2), {'b': 20}))
self.assertEqual(f(2), ((1, 2), {}))
self.assertEqual(f(), ((1,), {}))
f.__setstate__((capture, (), {}, None))
self.assertEqual(signature(f), (capture, (), {}, {}))
self.assertEqual(f(2, b=20), ((2,), {'b': 20}))
self.assertEqual(f(2), ((2,), {}))
self.assertEqual(f(), ((), {}))
def test_setstate_errors(self):
f = self.partial(signature)
self.assertRaises(TypeError, f.__setstate__, (capture, (), {}))
self.assertRaises(TypeError, f.__setstate__, (capture, (), {}, {}, None))
self.assertRaises(TypeError, f.__setstate__, [capture, (), {}, None])
self.assertRaises(TypeError, f.__setstate__, (None, (), {}, None))
self.assertRaises(TypeError, f.__setstate__, (capture, None, {}, None))
self.assertRaises(TypeError, f.__setstate__, (capture, [], {}, None))
self.assertRaises(TypeError, f.__setstate__, (capture, (), [], None))
def test_setstate_subclasses(self):
f = self.partial(signature)
f.__setstate__((capture, MyTuple((1,)), MyDict(a=10), None))
s = signature(f)
self.assertEqual(s, (capture, (1,), dict(a=10), {}))
self.assertIs(type(s[1]), tuple)
self.assertIs(type(s[2]), dict)
r = f()
self.assertEqual(r, ((1,), {'a': 10}))
self.assertIs(type(r[0]), tuple)
self.assertIs(type(r[1]), dict)
f.__setstate__((capture, BadTuple((1,)), {}, None))
s = signature(f)
self.assertEqual(s, (capture, (1,), {}, {}))
self.assertIs(type(s[1]), tuple)
r = f(2)
self.assertEqual(r, ((1, 2), {}))
self.assertIs(type(r[0]), tuple)
def test_recursive_pickle(self):
with replaced_module('functools', self.module):
f = self.partial(capture)
f.__setstate__((f, (), {}, {}))
try:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
# gh-117008: Small limit since pickle uses C stack memory
with support.infinite_recursion(100):
with self.assertRaises(RecursionError):
pickle.dumps(f, proto)
finally:
f.__setstate__((capture, (), {}, {}))
f = self.partial(capture)
f.__setstate__((capture, (f,), {}, {}))
try:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
f_copy = pickle.loads(pickle.dumps(f, proto))
try:
self.assertIs(f_copy.args[0], f_copy)
finally:
f_copy.__setstate__((capture, (), {}, {}))
finally:
f.__setstate__((capture, (), {}, {}))
f = self.partial(capture)
f.__setstate__((capture, (), {'a': f}, {}))
try:
for proto in range(pickle.HIGHEST_PROTOCOL + 1):
f_copy = pickle.loads(pickle.dumps(f, proto))
try:
self.assertIs(f_copy.keywords['a'], f_copy)
finally:
f_copy.__setstate__((capture, (), {}, {}))
finally:
f.__setstate__((capture, (), {}, {}))
# Issue 6083: Reference counting bug
def test_setstate_refcount(self):
class BadSequence:
def __len__(self):
return 4
def __getitem__(self, key):
if key == 0:
return max
elif key == 1:
return tuple(range(1000000))
elif key in (2, 3):
return {}
raise IndexError
f = self.partial(object)
self.assertRaises(TypeError, f.__setstate__, BadSequence())
@unittest.skipUnless(c_functools, 'requires the C _functools module')
class TestPartialC(TestPartial, unittest.TestCase):
if c_functools:
module = c_functools
partial = c_functools.partial
def test_attributes_unwritable(self):
# attributes should not be writable
p = self.partial(capture, 1, 2, a=10, b=20)
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.partial(hex)
try:
del p.__dict__
except TypeError:
pass
else:
self.fail('partial object allowed __dict__ to be deleted')
def test_manually_adding_non_string_keyword(self):
p = self.partial(capture)
# Adding a non-string/unicode keyword to partial kwargs
p.keywords[1234] = 'value'
r = repr(p)
self.assertIn('1234', r)
self.assertIn("'value'", r)
with self.assertRaises(TypeError):
p()
def test_keystr_replaces_value(self):
p = self.partial(capture)
class MutatesYourDict(object):
def __str__(self):
p.keywords[self] = ['sth2']
return 'astr'
# Replacing the value during key formatting should keep the original
# value alive (at least long enough).
p.keywords[MutatesYourDict()] = ['sth']
r = repr(p)
self.assertIn('astr', r)
self.assertIn("['sth']", r)
class TestPartialPy(TestPartial, unittest.TestCase):
module = py_functools
partial = py_functools.partial
if c_functools:
class CPartialSubclass(c_functools.partial):
pass
class PyPartialSubclass(py_functools.partial):
pass
@unittest.skipUnless(c_functools, 'requires the C _functools module')
class TestPartialCSubclass(TestPartialC):
if c_functools:
partial = CPartialSubclass
# partial subclasses are not optimized for nested calls
test_nested_optimization = None
class TestPartialPySubclass(TestPartialPy):
partial = PyPartialSubclass
class TestPartialMethod(unittest.TestCase):
class A(object):
nothing = functools.partialmethod(capture)
positional = functools.partialmethod(capture, 1)
keywords = functools.partialmethod(capture, a=2)
both = functools.partialmethod(capture, 3, b=4)
spec_keywords = functools.partialmethod(capture, self=1, func=2)
nested = functools.partialmethod(positional, 5)
over_partial = functools.partialmethod(functools.partial(capture, c=6), 7)
static = functools.partialmethod(staticmethod(capture), 8)
cls = functools.partialmethod(classmethod(capture), d=9)
a = A()
def test_arg_combinations(self):
self.assertEqual(self.a.nothing(), ((self.a,), {}))
self.assertEqual(self.a.nothing(5), ((self.a, 5), {}))
self.assertEqual(self.a.nothing(c=6), ((self.a,), {'c': 6}))
self.assertEqual(self.a.nothing(5, c=6), ((self.a, 5), {'c': 6}))
self.assertEqual(self.a.positional(), ((self.a, 1), {}))
self.assertEqual(self.a.positional(5), ((self.a, 1, 5), {}))
self.assertEqual(self.a.positional(c=6), ((self.a, 1), {'c': 6}))
self.assertEqual(self.a.positional(5, c=6), ((self.a, 1, 5), {'c': 6}))
self.assertEqual(self.a.keywords(), ((self.a,), {'a': 2}))
self.assertEqual(self.a.keywords(5), ((self.a, 5), {'a': 2}))
self.assertEqual(self.a.keywords(c=6), ((self.a,), {'a': 2, 'c': 6}))
self.assertEqual(self.a.keywords(5, c=6), ((self.a, 5), {'a': 2, 'c': 6}))
self.assertEqual(self.a.both(), ((self.a, 3), {'b': 4}))
self.assertEqual(self.a.both(5), ((self.a, 3, 5), {'b': 4}))
self.assertEqual(self.a.both(c=6), ((self.a, 3), {'b': 4, 'c': 6}))
self.assertEqual(self.a.both(5, c=6), ((self.a, 3, 5), {'b': 4, 'c': 6}))
self.assertEqual(self.A.both(self.a, 5, c=6), ((self.a, 3, 5), {'b': 4, 'c': 6}))
self.assertEqual(self.a.spec_keywords(), ((self.a,), {'self': 1, 'func': 2}))
def test_nested(self):
self.assertEqual(self.a.nested(), ((self.a, 1, 5), {}))
self.assertEqual(self.a.nested(6), ((self.a, 1, 5, 6), {}))
self.assertEqual(self.a.nested(d=7), ((self.a, 1, 5), {'d': 7}))
self.assertEqual(self.a.nested(6, d=7), ((self.a, 1, 5, 6), {'d': 7}))
self.assertEqual(self.A.nested(self.a, 6, d=7), ((self.a, 1, 5, 6), {'d': 7}))
def test_over_partial(self):
self.assertEqual(self.a.over_partial(), ((self.a, 7), {'c': 6}))
self.assertEqual(self.a.over_partial(5), ((self.a, 7, 5), {'c': 6}))
self.assertEqual(self.a.over_partial(d=8), ((self.a, 7), {'c': 6, 'd': 8}))
self.assertEqual(self.a.over_partial(5, d=8), ((self.a, 7, 5), {'c': 6, 'd': 8}))
self.assertEqual(self.A.over_partial(self.a, 5, d=8), ((self.a, 7, 5), {'c': 6, 'd': 8}))
def test_bound_method_introspection(self):
obj = self.a
self.assertIs(obj.both.__self__, obj)
self.assertIs(obj.nested.__self__, obj)
self.assertIs(obj.over_partial.__self__, obj)
self.assertIs(obj.cls.__self__, self.A)
self.assertIs(self.A.cls.__self__, self.A)
def test_unbound_method_retrieval(self):
obj = self.A
self.assertFalse(hasattr(obj.both, "__self__"))
self.assertFalse(hasattr(obj.nested, "__self__"))
self.assertFalse(hasattr(obj.over_partial, "__self__"))
self.assertFalse(hasattr(obj.static, "__self__"))
self.assertFalse(hasattr(self.a.static, "__self__"))
def test_descriptors(self):
for obj in [self.A, self.a]:
with self.subTest(obj=obj):
self.assertEqual(obj.static(), ((8,), {}))
self.assertEqual(obj.static(5), ((8, 5), {}))
self.assertEqual(obj.static(d=8), ((8,), {'d': 8}))
self.assertEqual(obj.static(5, d=8), ((8, 5), {'d': 8}))
self.assertEqual(obj.cls(), ((self.A,), {'d': 9}))
self.assertEqual(obj.cls(5), ((self.A, 5), {'d': 9}))
self.assertEqual(obj.cls(c=8), ((self.A,), {'c': 8, 'd': 9}))
self.assertEqual(obj.cls(5, c=8), ((self.A, 5), {'c': 8, 'd': 9}))
def test_overriding_keywords(self):
self.assertEqual(self.a.keywords(a=3), ((self.a,), {'a': 3}))
self.assertEqual(self.A.keywords(self.a, a=3), ((self.a,), {'a': 3}))
def test_invalid_args(self):
with self.assertRaises(TypeError):
class B(object):
method = functools.partialmethod(None, 1)
with self.assertRaises(TypeError):
class B:
method = functools.partialmethod()
with self.assertRaises(TypeError):
class B:
method = functools.partialmethod(func=capture, a=1)
def test_repr(self):
self.assertEqual(repr(vars(self.A)['both']),
'functools.partialmethod({}, 3, b=4)'.format(capture))
def test_abstract(self):
class Abstract(abc.ABCMeta):
@abc.abstractmethod
def add(self, x, y):
pass
add5 = functools.partialmethod(add, 5)
self.assertTrue(Abstract.add.__isabstractmethod__)
self.assertTrue(Abstract.add5.__isabstractmethod__)
for func in [self.A.static, self.A.cls, self.A.over_partial, self.A.nested, self.A.both]:
self.assertFalse(getattr(func, '__isabstractmethod__', False))
def test_positional_only(self):
def f(a, b, /):
return a + b
p = functools.partial(f, 1)
self.assertEqual(p(2), f(1, 2))
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.assertIs(getattr(wrapper, name), 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:
if name == "__dict__" and key == "__wrapped__":
# __wrapped__ is overwritten by the update code
continue
self.assertIs(wrapped_attr[key], wrapper_attr[key])
# Check __wrapped__
self.assertIs(wrapper.__wrapped__, wrapped)
def _default_update(self):
def f[T](a:'This is a new annotation'):
"""This is a test"""
pass
f.attr = 'This is also a test'
f.__wrapped__ = "This is a bald faced lie"
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)
T, = f.__type_params__
self.assertIs(wrapper.__wrapped__, f)
self.assertEqual(wrapper.__name__, 'f')
self.assertEqual(wrapper.__qualname__, f.__qualname__)
self.assertEqual(wrapper.attr, 'This is also a test')
self.assertEqual(wrapper.__annotations__['a'], 'This is a new annotation')
self.assertNotIn('b', wrapper.__annotations__)
self.assertEqual(wrapper.__type_params__, (T,))
@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.assertNotEqual(wrapper.__qualname__, f.__qualname__)
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.assertNotEqual(wrapper.__qualname__, f.__qualname__)
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)
@support.requires_docstrings
@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__, {})
def test_update_type_wrapper(self):
def wrapper(*args): pass
functools.update_wrapper(wrapper, type)
self.assertEqual(wrapper.__name__, 'type')
self.assertEqual(wrapper.__annotations__, {})
self.assertEqual(wrapper.__type_params__, ())
class TestWraps(TestUpdateWrapper):
def _default_update(self):
def f():
"""This is a test"""
pass
f.attr = 'This is also a test'
f.__wrapped__ = "This is still a bald faced lie"
@functools.wraps(f)
def wrapper():
pass
return wrapper, f
def test_default_update(self):
wrapper, f = self._default_update()
self.check_wrapper(wrapper, f)
self.assertEqual(wrapper.__name__, 'f')
self.assertEqual(wrapper.__qualname__, f.__qualname__)
self.assertEqual(wrapper.attr, 'This is also a test')
@unittest.skipIf(sys.flags.optimize >= 2,
"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.assertNotEqual(wrapper.__qualname__, f.__qualname__)
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.assertNotEqual(wrapper.__qualname__, f.__qualname__)
self.assertEqual(wrapper.__doc__, None)
self.assertEqual(wrapper.attr, 'This is a different test')
self.assertEqual(wrapper.dict_attr, f.dict_attr)
class TestReduce:
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.reduce(add, ['a', 'b', 'c'], ''), 'abc')
self.assertEqual(
self.reduce(add, [['a', 'c'], [], ['d', 'w']], []),
['a','c','d','w']
)
self.assertEqual(self.reduce(lambda x, y: x*y, range(2,8), 1), 5040)
self.assertEqual(
self.reduce(lambda x, y: x*y, range(2,21), 1),
2432902008176640000
)
self.assertEqual(self.reduce(add, Squares(10)), 285)
self.assertEqual(self.reduce(add, Squares(10), 0), 285)
self.assertEqual(self.reduce(add, Squares(0), 0), 0)
self.assertRaises(TypeError, self.reduce)
self.assertRaises(TypeError, self.reduce, 42, 42)
self.assertRaises(TypeError, self.reduce, 42, 42, 42)
self.assertEqual(self.reduce(42, "1"), "1") # func is never called with one item
self.assertEqual(self.reduce(42, "", "1"), "1") # func is never called with one item
self.assertRaises(TypeError, self.reduce, 42, (42, 42))
self.assertRaises(TypeError, self.reduce, add, []) # arg 2 must not be empty sequence with no initial value
self.assertRaises(TypeError, self.reduce, add, "")
self.assertRaises(TypeError, self.reduce, add, ())
self.assertRaises(TypeError, self.reduce, add, object())
class TestFailingIter:
def __iter__(self):
raise RuntimeError
self.assertRaises(RuntimeError, self.reduce, add, TestFailingIter())
self.assertEqual(self.reduce(add, [], None), None)
self.assertEqual(self.reduce(add, [], 42), 42)
class BadSeq:
def __getitem__(self, index):
raise ValueError
self.assertRaises(ValueError, self.reduce, 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.reduce(add, SequenceClass(5)), 10)
self.assertEqual(self.reduce(add, SequenceClass(5), 42), 52)
self.assertRaises(TypeError, self.reduce, add, SequenceClass(0))
self.assertEqual(self.reduce(add, SequenceClass(0), 42), 42)
self.assertEqual(self.reduce(add, SequenceClass(1)), 0)
self.assertEqual(self.reduce(add, SequenceClass(1), 42), 42)
d = {"one": 1, "two": 2, "three": 3}
self.assertEqual(self.reduce(add, d), "".join(d.keys()))
@unittest.skipUnless(c_functools, 'requires the C _functools module')
class TestReduceC(TestReduce, unittest.TestCase):
if c_functools:
reduce = c_functools.reduce
class TestReducePy(TestReduce, unittest.TestCase):
reduce = staticmethod(py_functools.reduce)
class TestCmpToKey:
def test_cmp_to_key(self):
def cmp1(x, y):
return (x > y) - (x < y)
key = self.cmp_to_key(cmp1)
self.assertEqual(key(3), key(3))
self.assertGreater(key(3), key(1))
self.assertGreaterEqual(key(3), key(3))
def cmp2(x, y):
return int(x) - int(y)
key = self.cmp_to_key(cmp2)
self.assertEqual(key(4.0), key('4'))
self.assertLess(key(2), key('35'))
self.assertLessEqual(key(2), key('35'))
self.assertNotEqual(key(2), key('35'))
def test_cmp_to_key_arguments(self):
def cmp1(x, y):
return (x > y) - (x < y)
key = self.cmp_to_key(mycmp=cmp1)
self.assertEqual(key(obj=3), key(obj=3))
self.assertGreater(key(obj=3), key(obj=1))
with self.assertRaises((TypeError, AttributeError)):
key(3) > 1 # rhs is not a K object
with self.assertRaises((TypeError, AttributeError)):
1 < key(3) # lhs is not a K object
with self.assertRaises(TypeError):
key = self.cmp_to_key() # too few args
with self.assertRaises(TypeError):
key = self.cmp_to_key(cmp1, None) # too many args
key = self.cmp_to_key(cmp1)
with self.assertRaises(TypeError):
key() # too few args
with self.assertRaises(TypeError):
key(None, None) # too many args
def test_bad_cmp(self):
def cmp1(x, y):
raise ZeroDivisionError
key = self.cmp_to_key(cmp1)
with self.assertRaises(ZeroDivisionError):
key(3) > key(1)
class BadCmp:
def __lt__(self, other):
raise ZeroDivisionError
def cmp1(x, y):
return BadCmp()
with self.assertRaises(ZeroDivisionError):
key(3) > key(1)
def test_obj_field(self):
def cmp1(x, y):
return (x > y) - (x < y)
key = self.cmp_to_key(mycmp=cmp1)
self.assertEqual(key(50).obj, 50)
def test_sort_int(self):
def mycmp(x, y):
return y - x
self.assertEqual(sorted(range(5), key=self.cmp_to_key(mycmp)),
[4, 3, 2, 1, 0])
def test_sort_int_str(self):
def mycmp(x, y):
x, y = int(x), int(y)
return (x > y) - (x < y)
values = [5, '3', 7, 2, '0', '1', 4, '10', 1]
values = sorted(values, key=self.cmp_to_key(mycmp))
self.assertEqual([int(value) for value in values],
[0, 1, 1, 2, 3, 4, 5, 7, 10])
def test_hash(self):
def mycmp(x, y):
return y - x
key = self.cmp_to_key(mycmp)
k = key(10)
self.assertRaises(TypeError, hash, k)
self.assertNotIsInstance(k, collections.abc.Hashable)
@unittest.skipIf(support.MISSING_C_DOCSTRINGS,
"Signature information for builtins requires docstrings")
def test_cmp_to_signature(self):
sig = Signature.from_callable(self.cmp_to_key)
self.assertEqual(str(sig), '(mycmp)')
def mycmp(x, y):
return y - x
sig = Signature.from_callable(self.cmp_to_key(mycmp))
self.assertEqual(str(sig), '(obj)')
@unittest.skipUnless(c_functools, 'requires the C _functools module')
class TestCmpToKeyC(TestCmpToKey, unittest.TestCase):
if c_functools:
cmp_to_key = c_functools.cmp_to_key
@support.cpython_only
def test_disallow_instantiation(self):
# Ensure that the type disallows instantiation (bpo-43916)
support.check_disallow_instantiation(
self, type(c_functools.cmp_to_key(None))
)
class TestCmpToKeyPy(TestCmpToKey, unittest.TestCase):
cmp_to_key = staticmethod(py_functools.cmp_to_key)
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))