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Commit4be9726

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bpo-38293: Allow shallow and deep copying of property objects (GH-16438)
Copying property objects results in a TypeError. Steps to reproduce:```>>> import copy>>> obj = property()>>> copy.copy(obj)````This affects both shallow and deep copying.My idea for a fix is to add property objects to the list of "atomic" objects in the copy module.These already include types like functions and type objects.I also added property objects to the unit tests test_copy_atomic and test_deepcopy_atomic. This is my first PR, and it's highly likely I've made some mistake, so please be kind :)https://bugs.python.org/issue38293(cherry picked from commit9f3fc6c)Co-authored-by: Guðni Natan Gunnarsson <1493259+GudniNatan@users.noreply.github.com>
1 parenta993658 commit4be9726

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-3
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3 files changed

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‎Lib/copy.py‎

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Original file line numberDiff line numberDiff line change
@@ -111,7 +111,7 @@ def copy(x):
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def_copy_immutable(x):
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returnx
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fortin (type(None),int,float,bool,complex,str,tuple,
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bytes,frozenset,type,range,slice,
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bytes,frozenset,type,range,slice,property,
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types.BuiltinFunctionType,type(Ellipsis),type(NotImplemented),
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types.FunctionType,weakref.ref):
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d[t]=_copy_immutable
@@ -206,6 +206,7 @@ def _deepcopy_atomic(x, memo):
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d[types.BuiltinFunctionType]=_deepcopy_atomic
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d[types.FunctionType]=_deepcopy_atomic
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d[weakref.ref]=_deepcopy_atomic
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d[property]=_deepcopy_atomic
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def_deepcopy_list(x,memo,deepcopy=deepcopy):
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y= []

‎Lib/test/test_copy.py‎

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -99,7 +99,7 @@ class WithMetaclass(metaclass=abc.ABCMeta):
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42,2**100,3.14,True,False,1j,
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"hello","hello\u1234",f.__code__,
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b"world",bytes(range(256)),range(10),slice(1,10,2),
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NewStyle,Classic,max,WithMetaclass]
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NewStyle,Classic,max,WithMetaclass,property()]
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forxintests:
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self.assertIs(copy.copy(x),x)
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@@ -357,7 +357,7 @@ def f():
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pass
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tests= [None,42,2**100,3.14,True,False,1j,
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"hello","hello\u1234",f.__code__,
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NewStyle,Classic,max]
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NewStyle,Classic,max,property()]
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forxintests:
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self.assertIs(copy.deepcopy(x),x)
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Lines changed: 1 addition & 0 deletions
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@@ -0,0 +1 @@
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Add:func:`copy.copy` and:func:`copy.deepcopy` support to:func:`property` objects.

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