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"""Unit tests for the copy module."""
import copy
import copyreg
import weakref
import abc
from operator import le, lt, ge, gt, eq, ne
import unittest
order_comparisons = le, lt, ge, gt
equality_comparisons = eq, ne
comparisons = order_comparisons + equality_comparisons
class TestCopy(unittest.TestCase):
# Attempt full line coverage of copy.py from top to bottom
def test_exceptions(self):
self.assertIs(copy.Error, copy.error)
self.assertTrue(issubclass(copy.Error, Exception))
# The copy() method
def test_copy_basic(self):
x = 42
y = copy.copy(x)
self.assertEqual(x, y)
def test_copy_copy(self):
class C(object):
def __init__(self, foo):
self.foo = foo
def __copy__(self):
return C(self.foo)
x = C(42)
y = copy.copy(x)
self.assertEqual(y.__class__, x.__class__)
self.assertEqual(y.foo, x.foo)
def test_copy_registry(self):
class C(object):
def __new__(cls, foo):
obj = object.__new__(cls)
obj.foo = foo
return obj
def pickle_C(obj):
return (C, (obj.foo,))
x = C(42)
self.assertRaises(TypeError, copy.copy, x)
copyreg.pickle(C, pickle_C, C)
y = copy.copy(x)
def test_copy_reduce_ex(self):
class C(object):
def __reduce_ex__(self, proto):
c.append(1)
return ""
def __reduce__(self):
self.fail("shouldn't call this")
c = []
x = C()
y = copy.copy(x)
self.assertIs(y, x)
self.assertEqual(c, [1])
def test_copy_reduce(self):
class C(object):
def __reduce__(self):
c.append(1)
return ""
c = []
x = C()
y = copy.copy(x)
self.assertIs(y, x)
self.assertEqual(c, [1])
def test_copy_cant(self):
class C(object):
def __getattribute__(self, name):
if name.startswith("__reduce"):
raise AttributeError(name)
return object.__getattribute__(self, name)
x = C()
self.assertRaises(copy.Error, copy.copy, x)
# Type-specific _copy_xxx() methods
def test_copy_atomic(self):
class Classic:
pass
class NewStyle(object):
pass
def f():
pass
class WithMetaclass(metaclass=abc.ABCMeta):
pass
tests = [None, ..., NotImplemented,
42, 2**100, 3.14, True, False, 1j,
"hello", "hello\u1234", f.__code__,
b"world", bytes(range(256)), range(10), slice(1, 10, 2),
NewStyle, Classic, max, WithMetaclass]
for x in tests:
self.assertIs(copy.copy(x), x)
def test_copy_list(self):
x = [1, 2, 3]
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
x = []
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
def test_copy_tuple(self):
x = (1, 2, 3)
self.assertIs(copy.copy(x), x)
x = ()
self.assertIs(copy.copy(x), x)
x = (1, 2, 3, [])
self.assertIs(copy.copy(x), x)
def test_copy_dict(self):
x = {"foo": 1, "bar": 2}
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
x = {}
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
def test_copy_set(self):
x = {1, 2, 3}
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
x = set()
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
def test_copy_frozenset(self):
x = frozenset({1, 2, 3})
self.assertIs(copy.copy(x), x)
x = frozenset()
self.assertIs(copy.copy(x), x)
def test_copy_bytearray(self):
x = bytearray(b'abc')
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
x = bytearray()
y = copy.copy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
def test_copy_inst_vanilla(self):
class C:
def __init__(self, foo):
self.foo = foo
def __eq__(self, other):
return self.foo == other.foo
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_copy(self):
class C:
def __init__(self, foo):
self.foo = foo
def __copy__(self):
return C(self.foo)
def __eq__(self, other):
return self.foo == other.foo
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_getinitargs(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getinitargs__(self):
return (self.foo,)
def __eq__(self, other):
return self.foo == other.foo
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_getnewargs(self):
class C(int):
def __new__(cls, foo):
self = int.__new__(cls)
self.foo = foo
return self
def __getnewargs__(self):
return self.foo,
def __eq__(self, other):
return self.foo == other.foo
x = C(42)
y = copy.copy(x)
self.assertIsInstance(y, C)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertEqual(y.foo, x.foo)
def test_copy_inst_getnewargs_ex(self):
class C(int):
def __new__(cls, *, foo):
self = int.__new__(cls)
self.foo = foo
return self
def __getnewargs_ex__(self):
return (), {'foo': self.foo}
def __eq__(self, other):
return self.foo == other.foo
x = C(foo=42)
y = copy.copy(x)
self.assertIsInstance(y, C)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertEqual(y.foo, x.foo)
def test_copy_inst_getstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return {"foo": self.foo}
def __eq__(self, other):
return self.foo == other.foo
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __setstate__(self, state):
self.foo = state["foo"]
def __eq__(self, other):
return self.foo == other.foo
x = C(42)
self.assertEqual(copy.copy(x), x)
def test_copy_inst_getstate_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return self.foo
def __setstate__(self, state):
self.foo = state
def __eq__(self, other):
return self.foo == other.foo
x = C(42)
self.assertEqual(copy.copy(x), x)
# State with boolean value is false (issue #25718)
x = C(0.0)
self.assertEqual(copy.copy(x), x)
# The deepcopy() method
def test_deepcopy_basic(self):
x = 42
y = copy.deepcopy(x)
self.assertEqual(y, x)
def test_deepcopy_memo(self):
# Tests of reflexive objects are under type-specific sections below.
# This tests only repetitions of objects.
x = []
x = [x, x]
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertIsNot(y[0], x[0])
self.assertIs(y[0], y[1])
def test_deepcopy_issubclass(self):
# XXX Note: there's no way to test the TypeError coming out of
# issubclass() -- this can only happen when an extension
# module defines a "type" that doesn't formally inherit from
# type.
class Meta(type):
pass
class C(metaclass=Meta):
pass
self.assertEqual(copy.deepcopy(C), C)
def test_deepcopy_deepcopy(self):
class C(object):
def __init__(self, foo):
self.foo = foo
def __deepcopy__(self, memo=None):
return C(self.foo)
x = C(42)
y = copy.deepcopy(x)
self.assertEqual(y.__class__, x.__class__)
self.assertEqual(y.foo, x.foo)
def test_deepcopy_registry(self):
class C(object):
def __new__(cls, foo):
obj = object.__new__(cls)
obj.foo = foo
return obj
def pickle_C(obj):
return (C, (obj.foo,))
x = C(42)
self.assertRaises(TypeError, copy.deepcopy, x)
copyreg.pickle(C, pickle_C, C)
y = copy.deepcopy(x)
def test_deepcopy_reduce_ex(self):
class C(object):
def __reduce_ex__(self, proto):
c.append(1)
return ""
def __reduce__(self):
self.fail("shouldn't call this")
c = []
x = C()
y = copy.deepcopy(x)
self.assertIs(y, x)
self.assertEqual(c, [1])
def test_deepcopy_reduce(self):
class C(object):
def __reduce__(self):
c.append(1)
return ""
c = []
x = C()
y = copy.deepcopy(x)
self.assertIs(y, x)
self.assertEqual(c, [1])
def test_deepcopy_cant(self):
class C(object):
def __getattribute__(self, name):
if name.startswith("__reduce"):
raise AttributeError(name)
return object.__getattribute__(self, name)
x = C()
self.assertRaises(copy.Error, copy.deepcopy, x)
# Type-specific _deepcopy_xxx() methods
def test_deepcopy_atomic(self):
class Classic:
pass
class NewStyle(object):
pass
def f():
pass
tests = [None, 42, 2**100, 3.14, True, False, 1j,
"hello", "hello\u1234", f.__code__,
NewStyle, Classic, max]
for x in tests:
self.assertIs(copy.deepcopy(x), x)
def test_deepcopy_list(self):
x = [[1, 2], 3]
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(x, y)
self.assertIsNot(x[0], y[0])
def test_deepcopy_reflexive_list(self):
x = []
x.append(x)
y = copy.deepcopy(x)
for op in comparisons:
self.assertRaises(RecursionError, op, y, x)
self.assertIsNot(y, x)
self.assertIs(y[0], y)
self.assertEqual(len(y), 1)
def test_deepcopy_empty_tuple(self):
x = ()
y = copy.deepcopy(x)
self.assertIs(x, y)
def test_deepcopy_tuple(self):
x = ([1, 2], 3)
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(x, y)
self.assertIsNot(x[0], y[0])
def test_deepcopy_tuple_of_immutables(self):
x = ((1, 2), 3)
y = copy.deepcopy(x)
self.assertIs(x, y)
def test_deepcopy_reflexive_tuple(self):
x = ([],)
x[0].append(x)
y = copy.deepcopy(x)
for op in comparisons:
self.assertRaises(RecursionError, op, y, x)
self.assertIsNot(y, x)
self.assertIsNot(y[0], x[0])
self.assertIs(y[0][0], y)
def test_deepcopy_dict(self):
x = {"foo": [1, 2], "bar": 3}
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(x, y)
self.assertIsNot(x["foo"], y["foo"])
def test_deepcopy_reflexive_dict(self):
x = {}
x['foo'] = x
y = copy.deepcopy(x)
for op in order_comparisons:
self.assertRaises(TypeError, op, y, x)
for op in equality_comparisons:
self.assertRaises(RecursionError, op, y, x)
self.assertIsNot(y, x)
self.assertIs(y['foo'], y)
self.assertEqual(len(y), 1)
def test_deepcopy_keepalive(self):
memo = {}
x = []
y = copy.deepcopy(x, memo)
self.assertIs(memo[id(memo)][0], x)
def test_deepcopy_dont_memo_immutable(self):
memo = {}
x = [1, 2, 3, 4]
y = copy.deepcopy(x, memo)
self.assertEqual(y, x)
# There's the entry for the new list, and the keep alive.
self.assertEqual(len(memo), 2)
memo = {}
x = [(1, 2)]
y = copy.deepcopy(x, memo)
self.assertEqual(y, x)
# Tuples with immutable contents are immutable for deepcopy.
self.assertEqual(len(memo), 2)
def test_deepcopy_inst_vanilla(self):
class C:
def __init__(self, foo):
self.foo = foo
def __eq__(self, other):
return self.foo == other.foo
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_inst_deepcopy(self):
class C:
def __init__(self, foo):
self.foo = foo
def __deepcopy__(self, memo):
return C(copy.deepcopy(self.foo, memo))
def __eq__(self, other):
return self.foo == other.foo
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_inst_getinitargs(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getinitargs__(self):
return (self.foo,)
def __eq__(self, other):
return self.foo == other.foo
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_inst_getnewargs(self):
class C(int):
def __new__(cls, foo):
self = int.__new__(cls)
self.foo = foo
return self
def __getnewargs__(self):
return self.foo,
def __eq__(self, other):
return self.foo == other.foo
x = C([42])
y = copy.deepcopy(x)
self.assertIsInstance(y, C)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertEqual(y.foo, x.foo)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_inst_getnewargs_ex(self):
class C(int):
def __new__(cls, *, foo):
self = int.__new__(cls)
self.foo = foo
return self
def __getnewargs_ex__(self):
return (), {'foo': self.foo}
def __eq__(self, other):
return self.foo == other.foo
x = C(foo=[42])
y = copy.deepcopy(x)
self.assertIsInstance(y, C)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertEqual(y.foo, x.foo)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_inst_getstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return {"foo": self.foo}
def __eq__(self, other):
return self.foo == other.foo
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_inst_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __setstate__(self, state):
self.foo = state["foo"]
def __eq__(self, other):
return self.foo == other.foo
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_inst_getstate_setstate(self):
class C:
def __init__(self, foo):
self.foo = foo
def __getstate__(self):
return self.foo
def __setstate__(self, state):
self.foo = state
def __eq__(self, other):
return self.foo == other.foo
x = C([42])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertIsNot(y.foo, x.foo)
# State with boolean value is false (issue #25718)
x = C([])
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y, x)
self.assertIsNot(y.foo, x.foo)
def test_deepcopy_reflexive_inst(self):
class C:
pass
x = C()
x.foo = x
y = copy.deepcopy(x)
self.assertIsNot(y, x)
self.assertIs(y.foo, y)
def test_deepcopy_range(self):
class I(int):
pass
x = range(I(10))
y = copy.deepcopy(x)
self.assertIsNot(y, x)
self.assertEqual(y, x)
self.assertIsNot(y.stop, x.stop)
self.assertEqual(y.stop, x.stop)
self.assertIsInstance(y.stop, I)
# _reconstruct()
def test_reconstruct_string(self):
class C(object):
def __reduce__(self):
return ""
x = C()
y = copy.copy(x)
self.assertIs(y, x)
y = copy.deepcopy(x)
self.assertIs(y, x)
def test_reconstruct_nostate(self):
class C(object):
def __reduce__(self):
return (C, ())
x = C()
x.foo = 42
y = copy.copy(x)
self.assertIs(y.__class__, x.__class__)
y = copy.deepcopy(x)
self.assertIs(y.__class__, x.__class__)
def test_reconstruct_state(self):
class C(object):
def __reduce__(self):
return (C, (), self.__dict__)
def __eq__(self, other):
return self.__dict__ == other.__dict__
x = C()
x.foo = [42]
y = copy.copy(x)
self.assertEqual(y, x)
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y.foo, x.foo)
def test_reconstruct_state_setstate(self):
class C(object):
def __reduce__(self):
return (C, (), self.__dict__)
def __setstate__(self, state):
self.__dict__.update(state)
def __eq__(self, other):
return self.__dict__ == other.__dict__
x = C()
x.foo = [42]
y = copy.copy(x)
self.assertEqual(y, x)
y = copy.deepcopy(x)
self.assertEqual(y, x)
self.assertIsNot(y.foo, x.foo)
def test_reconstruct_reflexive(self):
class C(object):
pass
x = C()
x.foo = x
y = copy.deepcopy(x)
self.assertIsNot(y, x)
self.assertIs(y.foo, y)
# Additions for Python 2.3 and pickle protocol 2
def test_reduce_4tuple(self):
class C(list):
def __reduce__(self):
return (C, (), self.__dict__, iter(self))
def __eq__(self, other):
return (list(self) == list(other) and
self.__dict__ == other.__dict__)
x = C([[1, 2], 3])
y = copy.copy(x)
self.assertEqual(x, y)
self.assertIsNot(x, y)
self.assertIs(x[0], y[0])
y = copy.deepcopy(x)
self.assertEqual(x, y)
self.assertIsNot(x, y)
self.assertIsNot(x[0], y[0])
def test_reduce_5tuple(self):
class C(dict):
def __reduce__(self):
return (C, (), self.__dict__, None, self.items())
def __eq__(self, other):
return (dict(self) == dict(other) and
self.__dict__ == other.__dict__)
x = C([("foo", [1, 2]), ("bar", 3)])
y = copy.copy(x)
self.assertEqual(x, y)
self.assertIsNot(x, y)
self.assertIs(x["foo"], y["foo"])
y = copy.deepcopy(x)
self.assertEqual(x, y)
self.assertIsNot(x, y)
self.assertIsNot(x["foo"], y["foo"])
def test_copy_slots(self):
class C(object):
__slots__ = ["foo"]
x = C()
x.foo = [42]
y = copy.copy(x)
self.assertIs(x.foo, y.foo)
def test_deepcopy_slots(self):
class C(object):
__slots__ = ["foo"]
x = C()
x.foo = [42]
y = copy.deepcopy(x)
self.assertEqual(x.foo, y.foo)
self.assertIsNot(x.foo, y.foo)
def test_deepcopy_dict_subclass(self):
class C(dict):
def __init__(self, d=None):
if not d:
d = {}
self._keys = list(d.keys())
super().__init__(d)
def __setitem__(self, key, item):
super().__setitem__(key, item)
if key not in self._keys:
self._keys.append(key)
x = C(d={'foo':0})
y = copy.deepcopy(x)
self.assertEqual(x, y)
self.assertEqual(x._keys, y._keys)
self.assertIsNot(x, y)
x['bar'] = 1
self.assertNotEqual(x, y)
self.assertNotEqual(x._keys, y._keys)
def test_copy_list_subclass(self):
class C(list):
pass
x = C([[1, 2], 3])
x.foo = [4, 5]
y = copy.copy(x)
self.assertEqual(list(x), list(y))
self.assertEqual(x.foo, y.foo)
self.assertIs(x[0], y[0])
self.assertIs(x.foo, y.foo)
def test_deepcopy_list_subclass(self):
class C(list):
pass
x = C([[1, 2], 3])
x.foo = [4, 5]
y = copy.deepcopy(x)
self.assertEqual(list(x), list(y))
self.assertEqual(x.foo, y.foo)
self.assertIsNot(x[0], y[0])
self.assertIsNot(x.foo, y.foo)
def test_copy_tuple_subclass(self):
class C(tuple):
pass
x = C([1, 2, 3])
self.assertEqual(tuple(x), (1, 2, 3))
y = copy.copy(x)
self.assertEqual(tuple(y), (1, 2, 3))
def test_deepcopy_tuple_subclass(self):
class C(tuple):
pass
x = C([[1, 2], 3])
self.assertEqual(tuple(x), ([1, 2], 3))
y = copy.deepcopy(x)
self.assertEqual(tuple(y), ([1, 2], 3))
self.assertIsNot(x, y)
self.assertIsNot(x[0], y[0])
def test_getstate_exc(self):
class EvilState(object):
def __getstate__(self):
raise ValueError("ain't got no stickin' state")
self.assertRaises(ValueError, copy.copy, EvilState())
def test_copy_function(self):
self.assertEqual(copy.copy(global_foo), global_foo)
def foo(x, y): return x+y
self.assertEqual(copy.copy(foo), foo)
bar = lambda: None
self.assertEqual(copy.copy(bar), bar)
def test_deepcopy_function(self):
self.assertEqual(copy.deepcopy(global_foo), global_foo)
def foo(x, y): return x+y
self.assertEqual(copy.deepcopy(foo), foo)
bar = lambda: None
self.assertEqual(copy.deepcopy(bar), bar)
def _check_weakref(self, _copy):
class C(object):
pass
obj = C()
x = weakref.ref(obj)
y = _copy(x)
self.assertIs(y, x)
del obj
y = _copy(x)
self.assertIs(y, x)
def test_copy_weakref(self):
self._check_weakref(copy.copy)
def test_deepcopy_weakref(self):
self._check_weakref(copy.deepcopy)
def _check_copy_weakdict(self, _dicttype):
class C(object):
pass
a, b, c, d = [C() for i in range(4)]
u = _dicttype()
u[a] = b
u[c] = d
v = copy.copy(u)
self.assertIsNot(v, u)
self.assertEqual(v, u)
self.assertEqual(v[a], b)
self.assertEqual(v[c], d)
self.assertEqual(len(v), 2)
del c, d
self.assertEqual(len(v), 1)
x, y = C(), C()
# The underlying containers are decoupled
v[x] = y
self.assertNotIn(x, u)
def test_copy_weakkeydict(self):
self._check_copy_weakdict(weakref.WeakKeyDictionary)
def test_copy_weakvaluedict(self):
self._check_copy_weakdict(weakref.WeakValueDictionary)
def test_deepcopy_weakkeydict(self):
class C(object):
def __init__(self, i):
self.i = i
a, b, c, d = [C(i) for i in range(4)]
u = weakref.WeakKeyDictionary()
u[a] = b
u[c] = d
# Keys aren't copied, values are
v = copy.deepcopy(u)
self.assertNotEqual(v, u)
self.assertEqual(len(v), 2)
self.assertIsNot(v[a], b)
self.assertIsNot(v[c], d)
self.assertEqual(v[a].i, b.i)
self.assertEqual(v[c].i, d.i)
del c
self.assertEqual(len(v), 1)
def test_deepcopy_weakvaluedict(self):
class C(object):
def __init__(self, i):
self.i = i
a, b, c, d = [C(i) for i in range(4)]
u = weakref.WeakValueDictionary()
u[a] = b
u[c] = d
# Keys are copied, values aren't
v = copy.deepcopy(u)
self.assertNotEqual(v, u)
self.assertEqual(len(v), 2)
(x, y), (z, t) = sorted(v.items(), key=lambda pair: pair[0].i)
self.assertIsNot(x, a)
self.assertEqual(x.i, a.i)
self.assertIs(y, b)
self.assertIsNot(z, c)
self.assertEqual(z.i, c.i)
self.assertIs(t, d)
del x, y, z, t
del d
self.assertEqual(len(v), 1)
def test_deepcopy_bound_method(self):
class Foo(object):
def m(self):
pass
f = Foo()
f.b = f.m
g = copy.deepcopy(f)
self.assertEqual(g.m, g.b)
self.assertIs(g.b.__self__, g)
g.b()
def global_foo(x, y): return x+y
if __name__ == "__main__":
unittest.main()
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