def provides_distribution(self, name, version=None):
        """
        Iterates over all distributions to find which distributions provide *name*.
        If a *version* is provided, it will be used to filter the results.

        This function only returns the first result found, since no more than
        one values are expected. If the directory is not found, returns ``None``.

        :parameter version: a version specifier that indicates the version
                            required, conforming to the format in ``PEP-345``

        :type name: string
        :type version: string
        """
        matcher = None
        if not version is None:
            try:
                matcher = self._scheme.matcher('%s (%s)' % (name, version))
            except __HOLE__:
                raise DistlibException('invalid name or version: %r, %r' %
                                      (name, version))

        for dist in self.get_distributions():
            provided = dist.provides

            for p in provided:
                p_name, p_ver = parse_name_and_version(p)
                if matcher is None:
                    if p_name == name:
                        yield dist
                        break
                else:
                    if p_name == name and matcher.match(p_ver):
                        yield dist
                        break
dataset/ETHPy150Open anzev/hedwig/build/pip/pip/_vendor/distlib/database.py/DistributionPath.provides_distribution