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bpo-43680: Deprecate io.OpenWrapper (GH-25357)

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Deprecate io.OpenWrapper and _pyio.OpenWrapper: use io.open and
_pyio.open instead. Until Python 3.9, _pyio.open was not a static
method and builtins.open was set to OpenWrapper to not become a bound
method when set to a class variable. _io.open is a built-in function
whereas _pyio.open is a Python function. In Python 3.10, _pyio.open()
is now a static method, and builtins.open() is now io.open().
This commit is contained in:
Victor Stinner 2021-04-14 03:24:33 +02:00 • committed by GitHub
parent 11159d2c9d
commit 3bc694d5f3
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4 changed files with 44 additions and 15 deletions
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26
Lib/_pyio.py
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@ -311,18 +311,20 @@ except AttributeError:
open_code = _open_code_with_warning
class DocDescriptor:
"""Helper for builtins.open.__doc__
"""
def __get__(self, obj, typ=None):
return (
"open(file, mode='r', buffering=-1, encoding=None, "
"errors=None, newline=None, closefd=True)\n\n" +
open.__doc__)
# bpo-43680: Alias to open() kept for backward compatibility
OpenWrapper = open
def __getattr__(name):
if name == "OpenWrapper":
# bpo-43680: Until Python 3.9, _pyio.open was not a static method and
# builtins.open was set to OpenWrapper to not become a bound method
# when set to a class variable. _io.open is a built-in function whereas
# _pyio.open is a Python function. In Python 3.10, _pyio.open() is now
# a static method, and builtins.open() is now io.open().
import warnings
warnings.warn('OpenWrapper is deprecated, use open instead',
DeprecationWarning, stacklevel=2)
global OpenWrapper
OpenWrapper = open
return OpenWrapper
raise AttributeError(name)
# In normal operation, both `UnsupportedOperation`s should be bound to the