10.09.17 21:48, Ivan Levkivskyi пише:
# lib.py
from warnings import warn
deprecated_names = ["old_function", ...]
def _deprecated_old_function(arg, other):
...
def __getattr__(name):
if name in deprecated_names:
warn(f"{name} is deprecated", DeprecationWarning)
return globals()[f"_deprecated_{name}"]
raise AttributeError(f"module {__name__} has no attribute {name}")
# main.py
from lib import old_function # Works, but emits the warning
I think the PEP should provide better examples, because they will be
copied in third-party code.
For keeping all functionality (in particularly be pickleable) the
deprecated function should preserve its name.
def old_function(arg, other):
...
_deprecated_old_function = old_function
del old_function
or
def _deprecated_old_function(arg, other):
...
_deprecated_old_function.__name__ = 'old_function'
_deprecated_old_function.__qualname__ = 'old_function'
(I prefer the former variant.)
I'm wondering if it is worth to provide a special helper that will
rename the deprecated function and create the corresponding __getattr__
function.
It could be possible to create helpers that implement module-level
properties too.
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