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| import functools | |
| import warnings | |
| class AVDeprecationWarning(DeprecationWarning): | |
| pass | |
| class AttributeRenamedWarning(AVDeprecationWarning): | |
| pass | |
| class MethodDeprecationWarning(AVDeprecationWarning): | |
| pass | |
| # DeprecationWarning is not printed by default (unless in __main__). We | |
| # really want these to be seen, but also to use the "correct" base classes. | |
| # So we're putting a filter in place to show our warnings. The users can | |
| # turn them back off if they want. | |
| warnings.filterwarnings("default", "", AVDeprecationWarning) | |
| class renamed_attr: | |
| """Proxy for renamed attributes (or methods) on classes. | |
| Getting and setting values will be redirected to the provided name, | |
| and warnings will be issues every time. | |
| """ | |
| def __init__(self, new_name): | |
| self.new_name = new_name | |
| self._old_name = None | |
| def old_name(self, cls): | |
| if self._old_name is None: | |
| for k, v in vars(cls).items(): | |
| if v is self: | |
| self._old_name = k | |
| break | |
| return self._old_name | |
| def __get__(self, instance, cls): | |
| old_name = self.old_name(cls) | |
| warnings.warn( | |
| "{0}.{1} is deprecated; please use {0}.{2}.".format( | |
| cls.__name__, | |
| old_name, | |
| self.new_name, | |
| ), | |
| AttributeRenamedWarning, | |
| stacklevel=2, | |
| ) | |
| return getattr(instance if instance is not None else cls, self.new_name) | |
| def __set__(self, instance, value): | |
| old_name = self.old_name(instance.__class__) | |
| warnings.warn( | |
| "{0}.{1} is deprecated; please use {0}.{2}.".format( | |
| instance.__class__.__name__, | |
| old_name, | |
| self.new_name, | |
| ), | |
| AttributeRenamedWarning, | |
| stacklevel=2, | |
| ) | |
| setattr(instance, self.new_name, value) | |
| class method: | |
| def __init__(self, func): | |
| functools.update_wrapper(self, func, ("__name__", "__doc__")) | |
| self.func = func | |
| def __get__(self, instance, cls): | |
| warning = MethodDeprecationWarning( | |
| f"{cls.__name__}.{self.func.__name__} is deprecated." | |
| ) | |
| warnings.warn(warning, stacklevel=2) | |
| return self.func.__get__(instance, cls) | |