124 lines
3.5 KiB
Python
124 lines
3.5 KiB
Python
import warnings
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import functools
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__all__ = ["deprecated"]
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class deprecated:
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"""Decorator to mark a function or class as deprecated.
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Issue a warning when the function is called/the class is instantiated and
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adds a warning to the docstring.
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The optional extra argument will be appended to the deprecation message
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and the docstring. Note: to use this with the default value for extra, put
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in an empty of parentheses:
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>>> from sklearn.utils import deprecated
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>>> deprecated()
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<sklearn.utils.deprecation.deprecated object at ...>
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>>> @deprecated()
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... def some_function(): pass
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Parameters
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----------
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extra : str, default=''
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To be added to the deprecation messages.
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"""
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# Adapted from https://wiki.python.org/moin/PythonDecoratorLibrary,
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# but with many changes.
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def __init__(self, extra=''):
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self.extra = extra
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def __call__(self, obj):
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"""Call method
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Parameters
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----------
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obj : object
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"""
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if isinstance(obj, type):
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return self._decorate_class(obj)
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elif isinstance(obj, property):
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# Note that this is only triggered properly if the `property`
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# decorator comes before the `deprecated` decorator, like so:
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#
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# @deprecated(msg)
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# @property
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# def deprecated_attribute_(self):
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# ...
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return self._decorate_property(obj)
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else:
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return self._decorate_fun(obj)
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def _decorate_class(self, cls):
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msg = "Class %s is deprecated" % cls.__name__
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if self.extra:
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msg += "; %s" % self.extra
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# FIXME: we should probably reset __new__ for full generality
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init = cls.__init__
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def wrapped(*args, **kwargs):
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warnings.warn(msg, category=FutureWarning)
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return init(*args, **kwargs)
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cls.__init__ = wrapped
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wrapped.__name__ = '__init__'
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wrapped.__doc__ = self._update_doc(init.__doc__)
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wrapped.deprecated_original = init
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return cls
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def _decorate_fun(self, fun):
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"""Decorate function fun"""
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msg = "Function %s is deprecated" % fun.__name__
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if self.extra:
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msg += "; %s" % self.extra
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@functools.wraps(fun)
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def wrapped(*args, **kwargs):
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warnings.warn(msg, category=FutureWarning)
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return fun(*args, **kwargs)
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wrapped.__doc__ = self._update_doc(wrapped.__doc__)
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# Add a reference to the wrapped function so that we can introspect
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# on function arguments in Python 2 (already works in Python 3)
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wrapped.__wrapped__ = fun
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return wrapped
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def _decorate_property(self, prop):
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msg = self.extra
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@property
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def wrapped(*args, **kwargs):
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warnings.warn(msg, category=FutureWarning)
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return prop.fget(*args, **kwargs)
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return wrapped
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def _update_doc(self, olddoc):
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newdoc = "DEPRECATED"
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if self.extra:
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newdoc = "%s: %s" % (newdoc, self.extra)
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if olddoc:
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newdoc = "%s\n\n %s" % (newdoc, olddoc)
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return newdoc
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def _is_deprecated(func):
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"""Helper to check if func is wrapped by our deprecated decorator"""
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closures = getattr(func, '__closure__', [])
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if closures is None:
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closures = []
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is_deprecated = ('deprecated' in ''.join([c.cell_contents
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for c in closures
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if isinstance(c.cell_contents, str)]))
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return is_deprecated
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