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The methods here allow for api symbol versioning.
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__all__ = ['deprecated_function',
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'DEPRECATED_PARAMETER',
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'warn', 'set_warning_method', 'zero_seven',
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__all__ = ['warn', 'set_warning_method', 'zero_seven']
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from warnings import warn
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DEPRECATED_PARAMETER = "A deprecated parameter marker."
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zero_seven = "%s was deprecated in version 0.7."
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zero_eight = "%s was deprecated in version 0.8."
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zero_nine = "%s was deprecated in version 0.9."
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zero_ten = "%s was deprecated in version 0.10."
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zero_eleven = "%s was deprecated in version 0.11."
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zero_twelve = "%s was deprecated in version 0.12."
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zero_thirteen = "%s was deprecated in version 0.13."
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zero_fourteen = "%s was deprecated in version 0.14."
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zero_fifteen = "%s was deprecated in version 0.15."
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zero_sixteen = "%s was deprecated in version 0.16."
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zero_seventeen = "%s was deprecated in version 0.17."
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zero_eighteen = "%s was deprecated in version 0.18."
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zero_ninety = "%s was deprecated in version 0.90."
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zero_ninetyone = "%s was deprecated in version 0.91."
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zero_ninetytwo = "%s was deprecated in version 0.92."
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def set_warning_method(method):
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# add that on top of the primitives, once we have all three written
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def deprecation_string(a_callable, deprecation_version):
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"""Generate an automatic deprecation string for a_callable.
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:param a_callable: The callable to substitute into deprecation_version.
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:param deprecation_version: A deprecation format warning string. This should
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have a single %s operator in it. a_callable will be turned into a nice
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python symbol and then substituted into deprecation_version.
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# We also want to handle old-style classes, in particular exception, and
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# they don't have an im_class attribute.
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if getattr(a_callable, 'im_class', None) is None:
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symbol = "%s.%s" % (a_callable.__module__,
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symbol = "%s.%s.%s" % (a_callable.im_class.__module__,
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a_callable.im_class.__name__,
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return deprecation_version % symbol
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def deprecated_function(deprecation_version):
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"""Decorate a function so that use of it will trigger a warning."""
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def decorated_function(*args, **kwargs):
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"""This is the decorated function."""
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warn(deprecation_string(callable, deprecation_version),
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DeprecationWarning, stacklevel=2)
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symbol = "%s.%s" % (callable.__module__,
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warn(deprecation_version % symbol, DeprecationWarning)
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return callable(*args, **kwargs)
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_populate_decorated(callable, deprecation_version, "function",
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59
decorated_function)
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def decorated_method(self, *args, **kwargs):
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"""This is the decorated method."""
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if callable.__name__ == '__init__':
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symbol = "%s.%s" % (self.__class__.__module__,
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self.__class__.__name__,
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symbol = "%s.%s.%s" % (self.__class__.__module__,
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self.__class__.__name__,
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warn(deprecation_version % symbol, DeprecationWarning, stacklevel=2)
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symbol = "%s.%s.%s" % (self.__class__.__module__,
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self.__class__.__name__,
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warn(deprecation_version % symbol, DeprecationWarning)
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return callable(self, *args, **kwargs)
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_populate_decorated(callable, deprecation_version, "method",
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return method_decorator
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def deprecated_passed(parameter_value):
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"""Return True if parameter_value was used."""
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# FIXME: it might be nice to have a parameter deprecation decorator.
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# it would need to handle positional and *args and **kwargs parameters,
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# which means some mechanism to describe how the parameter was being
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# passed before deprecation, and some way to deprecate parameters that
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# were not at the end of the arg list. Thats needed for __init__ where
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# we cannot just forward to a new method name.I.e. in the following
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# examples we would want to have callers that pass any value to 'bad' be
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# given a warning - because we have applied:
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# @deprecated_parameter('bad', zero_seven)
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# def __init__(self, bad=None)
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# def __init__(self, bad, other)
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# def __init__(self, **kwargs)
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return not parameter_value is DEPRECATED_PARAMETER
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87
def _decorate_docstring(callable, deprecation_version, label,
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88
decorated_callable):
175
docstring_lines = callable.__doc__.split('\n')
89
docstring_lines = callable.__doc__.split('\n')
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90
if len(docstring_lines) == 0:
179
91
decorated_callable.__doc__ = deprecation_version % ("This " + label)
180
92
elif len(docstring_lines) == 1:
200
112
decorated_callable)
201
113
decorated_callable.__module__ = callable.__module__
202
114
decorated_callable.__name__ = callable.__name__
203
decorated_callable.is_deprecated = True
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def _dict_deprecation_wrapper(wrapped_method):
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"""Returns a closure that emits a warning and calls the superclass"""
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def cb(dep_dict, *args, **kwargs):
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msg = 'access to %s' % (dep_dict._variable_name, )
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msg = dep_dict._deprecation_version % (msg,)
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msg += ' ' + dep_dict._advice
213
warn(msg, DeprecationWarning, stacklevel=2)
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return wrapped_method(dep_dict, *args, **kwargs)
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class DeprecatedDict(dict):
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"""A dictionary that complains when read or written."""
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"""Create a dict that warns when read or modified.
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:param deprecation_version: something like zero_nine
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:param initial_value: The contents of the dict
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:param variable_name: This allows better warnings to be printed
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:param advice: String of advice on what callers should do instead
235
of using this variable.
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self._deprecation_version = deprecation_version
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self._variable_name = variable_name
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self._advice = advice
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dict.__init__(self, initial_value)
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# This isn't every possible method but it should trap anyone using the
243
# dict -- add more if desired
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__len__ = _dict_deprecation_wrapper(dict.__len__)
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__getitem__ = _dict_deprecation_wrapper(dict.__getitem__)
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__setitem__ = _dict_deprecation_wrapper(dict.__setitem__)
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__delitem__ = _dict_deprecation_wrapper(dict.__delitem__)
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keys = _dict_deprecation_wrapper(dict.keys)
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__contains__ = _dict_deprecation_wrapper(dict.__contains__)
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def deprecated_list(deprecation_version, variable_name,
253
initial_value, extra=None):
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"""Create a list that warns when modified
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:param deprecation_version: something like zero_nine
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:param initial_value: The contents of the list
258
:param variable_name: This allows better warnings to be printed
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:param extra: Extra info to print when printing a warning
262
subst_text = 'Modifying %s' % (variable_name,)
263
msg = deprecation_version % (subst_text,)
267
class _DeprecatedList(list):
268
__doc__ = list.__doc__ + msg
272
def _warn_deprecated(self, func, *args, **kwargs):
273
warn(msg, DeprecationWarning, stacklevel=3)
274
return func(self, *args, **kwargs)
276
def append(self, obj):
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"""appending to %s is deprecated""" % (variable_name,)
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return self._warn_deprecated(list.append, obj)
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def insert(self, index, obj):
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"""inserting to %s is deprecated""" % (variable_name,)
282
return self._warn_deprecated(list.insert, index, obj)
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def extend(self, iterable):
285
"""extending %s is deprecated""" % (variable_name,)
286
return self._warn_deprecated(list.extend, iterable)
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def remove(self, value):
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"""removing from %s is deprecated""" % (variable_name,)
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return self._warn_deprecated(list.remove, value)
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def pop(self, index=None):
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"""pop'ing from from %s is deprecated""" % (variable_name,)
295
return self._warn_deprecated(list.pop, index)
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return self._warn_deprecated(list.pop)
300
return _DeprecatedList(initial_value)