def __init__(self, metadata, path, env=None):
super(BaseInstalledDistribution, self).__init__(metadata)<EOL>self.path = path<EOL>self.dist_path = env<EOL>
Initialise an instance.
:param metadata: An instance of :class:`Metadata` which describes the
                 distribution. This will normally have been initialised
                 from a metadata file in the ``path``.
:param path:     The path of the ``.dist-info`` or ``.egg-info``
                 directory for the distribution.
:param env:      This is normally the :class:`DistributionPath`
                 instance where this distribution was found.