def remove(self, elem):
        """Remove a requirement.

        :param elem: a string or :class:`Requirement` instance.
        """
        if isinstance(elem, text_type):
            for requirement in self:
                if requirement.package == elem:
                    return super(Requirements, self).remove(requirement)
        return super(Requirements, self).remove(elem)
def reverse(self, request, view_name):
        """
        Returns the URL of this tenant.
        """
        http_type = 'https://' if request.is_secure() else 'http://'

        domain = get_current_site(request).domain

        url = ''.join((http_type, self.schema_name, '.', domain, reverse(view_name)))

        return url