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Location: kallithea/rhodecode/lib/vcs/utils/lazy.py - annotation

Vincent Caron
Pass on RhodeCode config file down to a python-based Hg hook via the extras pseudo-config key, see https://bitbucket.org/marcinkuzminski/rhodecode/issue/558/access-to-rhodecode-config-from-a-hg
class LazyProperty(object):
    """
    Decorator for easier creation of ``property`` from potentially expensive to
    calculate attribute of the class.

    Usage::

      class Foo(object):
          @LazyProperty
          def bar(self):
              print 'Calculating self._bar'
              return 42

    Taken from http://blog.pythonisito.com/2008/08/lazy-descriptors.html and
    used widely.
    """

    def __init__(self, func):
        self._func = func
        self.__module__ = func.__module__
        self.__name__ = func.__name__
        self.__doc__ = func.__doc__

    def __get__(self, obj, klass=None):
        if obj is None:
            return self
        result = obj.__dict__[self.__name__] = self._func(obj)
        return result