To signal to a user that a method (staticmethod, classmethod, or regular instance method) or a class or function is going to be removed at some point in the future the remove() function/decorator can be used to achieve this in a non-destructive manner.
A basic example to do just this (on a method/function):
>>> from debtcollector import removals
>>> import warnings
>>> warnings.simplefilter('always')
>>> class Car(object):
... @removals.remove
... def start(self):
... pass
...
>>> c = Car()
>>> c.start()
Expected output:
__main__:1: DeprecationWarning: Using function/method 'Car.start()' is deprecated
A basic example to do just this (on a class):
>>> from debtcollector import removals
>>> import warnings
>>> warnings.simplefilter('always')
>>> @removals.remove
... class Pinto(object):
... pass
...
>>> p = Pinto()
Expected output:
__main__:1: DeprecationWarning: Using class 'Pinto' is deprecated
A basic example to do just this (on a classmethod):
>>> from debtcollector import removals
>>> import warnings
>>> warnings.simplefilter("once")
>>> class OldAndBusted(object):
... @removals.remove
... @classmethod
... def fix_things(cls):
... pass
...
>>> OldAndBusted.fix_things()
Expected output:
__main__:1: DeprecationWarning: Using function/method 'OldAndBusted.fix_things()' is deprecated
A basic example to do just this (on a classmethod):
>>> import warnings
>>> warnings.simplefilter("once")
>>> from debtcollector import removals
>>> class OldAndBusted(object):
... @removals.removed_kwarg('resp', message="Please use 'response' instead")
... @classmethod
... def factory(cls, resp=None, response=None):
... response = resp or response
... return response
...
>>> OldAndBusted.factory(resp='super-duper')
'super-duper'
__main__:1: DeprecationWarning: Using the 'resp' argument is deprecated: Please use 'response' instead
A basic example to do just this (on a __init__ method):
>>> import warnings
>>> warnings.simplefilter("once")
>>> from debtcollector import removals
>>> class OldAndBusted(object):
... @removals.removed_kwarg('bleep')
... def __init__(self, bleep=None):
... self.bloop = bleep
...
>>> o = OldAndBusted(bleep=2)
__main__:1: DeprecationWarning: Using the 'bleep' argument is deprecated
To move a instance method from an existing one to a new one the moved_method() function/decorator can be used to achieve this in a non-destructive manner.
A basic example to do just this:
>>> from debtcollector import moves
>>> import warnings
>>> warnings.simplefilter('always')
>>> class Cat(object):
... @moves.moved_method('meow')
... def mewow(self):
... return self.meow()
... def meow(self):
... return 'kitty'
...
>>> c = Cat()
>>> c.mewow()
'kitty'
>>> c.meow()
'kitty'
Expected output:
__main__:1: DeprecationWarning: Method 'Cat.mewow()' has moved to 'Cat.meow()'
To move a instance property from an existing one to a new one the moved_property() function/decorator can be used to achieve this in a non-destructive manner.
A basic example to do just this:
>>> from debtcollector import moves
>>> import warnings
>>> warnings.simplefilter('always')
>>> class Dog(object):
... @property
... @moves.moved_property('bark')
... def burk(self):
... return self.bark
... @property
... def bark(self):
... return 'woof'
...
>>> d = Dog()
>>> d.burk
'woof'
>>> d.bark
'woof'
Expected output:
__main__:1: DeprecationWarning: Property 'Dog.burk' has moved to 'Dog.bark'
To move a class from an existing one to a new one the moved_class() type generator function can be used to achieve this in a non-destructive manner.
A basic example to do just this:
>>> from debtcollector import moves
>>> import warnings
>>> warnings.simplefilter('always')
>>> class WizBang(object):
... pass
...
>>> OldWizBang = moves.moved_class(WizBang, 'OldWizBang', __name__)
>>> a = OldWizBang()
>>> b = WizBang()
Expected output:
__main__:1: DeprecationWarning: Class '__main__.OldWizBang' has moved to '__main__.WizBang'
To notify the user when a keyword argument has been replaced with a new and improved keyword argument and the user is still using the old keyword argument the renamed_kwarg() function/decorator can be used to achieve this in a non-destructive manner.
A basic example to do just this:
>>> from debtcollector import renames
>>> import warnings
>>> warnings.simplefilter('always')
>>> @renames.renamed_kwarg('snizzle', 'nizzle')
... def do_the_deed(snizzle=True, nizzle=True):
... return (snizzle, nizzle)
...
>>> do_the_deed()
(True, True)
>>> do_the_deed(snizzle=False)
(False, True)
>>> do_the_deed(nizzle=False)
(True, False)
Expected output:
__main__:1: DeprecationWarning: Using the 'snizzle' argument is deprecated, please use the 'nizzle' argument instead
It is typically useful to tell the user when a deprecation has started and when the deprecated item will be offically removed (deleted or other). To enable this all the currently provided functions this library provides take a message, version and removal_version keyword arguments. These are used in forming the message that is shown to the user when they trigger the deprecated activity.
A basic example to do just this:
>>> from debtcollector import renames
>>> import warnings
>>> warnings.simplefilter('always')
>>> @renames.renamed_kwarg('snizzle', 'nizzle', version="0.5", removal_version="0.7")
... def do_the_deed(snizzle=True, nizzle=True):
... pass
...
>>> do_the_deed(snizzle=False)
Expected output:
__main__:1: DeprecationWarning: Using the 'snizzle' argument is deprecated in version '0.5' and will be removed in version '0.7', please use the 'nizzle' argument instead
If the removal_version is unknown the special character ? can be used instead (to denote that the deprecated activity will be removed sometime in the future).
A basic example to do just this:
>>> from debtcollector import renames
>>> import warnings
>>> warnings.simplefilter('always')
>>> @renames.renamed_kwarg('snizzle', 'nizzle', version="0.5", removal_version="?")
... def do_the_deed(snizzle=True, nizzle=True):
... pass
...
>>> do_the_deed(snizzle=False)
Expected output:
__main__:1: DeprecationWarning: Using the 'snizzle' argument is deprecated in version '0.5' and will be removed in a future version, please use the 'nizzle' argument instead
To further customize the message (with a special postfix) the message keyword argument can be provided.
A basic example to do just this:
>>> from debtcollector import renames
>>> import warnings
>>> warnings.simplefilter('always')
>>> @renames.renamed_kwarg('snizzle', 'nizzle', message="Pretty please stop using it")
... def do_the_deed(snizzle=True, nizzle=True):
... pass
...
>>> do_the_deed(snizzle=False)
Expected output:
__main__:1: DeprecationWarning: Using the 'snizzle' argument is deprecated, please use the 'nizzle' argument instead: Pretty please stop using it
For use-cases which do not fit the above decorators, properties other provided functionality the final option is to use debtcollectors the deprecate() function to make your own messages (using the message building logic that debtcollector uses itself).
A basic example to do just this:
>>> import warnings
>>> warnings.simplefilter("always")
>>> import debtcollector
>>> debtcollector.deprecate("This is no longer supported", version="1.0")
__main__:1: DeprecationWarning: This is no longer supported in version '1.0'