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8d43b8ea39
Also updates: - importlib-metadata-0.7 - jaraco-windows - jaraco.classes-1.5 - jaraco.collections-1.6.0 - jaraco.functools-1.20 - jaraco.structures-1.1.2 - jaraco.text-1.10.1 - jaraco.ui-1.6 - more-itertools-4.3.0 - path.py-11.5.0 - six-1.12.0
67 lines
1.4 KiB
Python
67 lines
1.4 KiB
Python
from __future__ import unicode_literals
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import six
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__metaclass__ = type
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class NonDataProperty:
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"""Much like the property builtin, but only implements __get__,
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making it a non-data property, and can be subsequently reset.
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See http://users.rcn.com/python/download/Descriptor.htm for more
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information.
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>>> class X(object):
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... @NonDataProperty
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... def foo(self):
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... return 3
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>>> x = X()
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>>> x.foo
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3
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>>> x.foo = 4
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>>> x.foo
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4
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"""
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def __init__(self, fget):
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assert fget is not None, "fget cannot be none"
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assert six.callable(fget), "fget must be callable"
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self.fget = fget
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def __get__(self, obj, objtype=None):
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if obj is None:
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return self
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return self.fget(obj)
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# from http://stackoverflow.com/a/5191224
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class ClassPropertyDescriptor:
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def __init__(self, fget, fset=None):
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self.fget = fget
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self.fset = fset
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def __get__(self, obj, klass=None):
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if klass is None:
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klass = type(obj)
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return self.fget.__get__(obj, klass)()
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def __set__(self, obj, value):
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if not self.fset:
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raise AttributeError("can't set attribute")
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type_ = type(obj)
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return self.fset.__get__(obj, type_)(value)
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def setter(self, func):
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if not isinstance(func, (classmethod, staticmethod)):
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func = classmethod(func)
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self.fset = func
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return self
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def classproperty(func):
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if not isinstance(func, (classmethod, staticmethod)):
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func = classmethod(func)
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return ClassPropertyDescriptor(func)
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