(dm)
return dm
Given a mapping of extras to dependencies, strip off
        environment markers and filter out any dependencies
        not matching the markers.
Given a mapping of extras to dependencies, strip off
        environment markers and filter out any dependencies
        not matching the markers.
Given a mapping of extras to dependencies strip off environment markers and filter out any dependencies not matching the markers .
def _filter_extras(dm):
        """
        Given a mapping of extras to dependencies, strip off
        environment markers and filter out any dependencies
        not matching the markers.
        """
        for extra in list(filter(None, dm)):
            new_extra = extra
            reqs = dm.pop(extra)
            new_extra, _, marker = extra.partition(':')
            fails_marker = marker and (
                invalid_marker(marker)
                or not evaluate_marker(marker)
            )
            if fails_marker:
                reqs = []
            new_extra = safe_extra(new_extra) or None

            dm.setdefault(new_extra, []).extend(reqs)
        return dm
def _filter_extras ( dm ) : for extra in list ( filter ( None , dm ) ) : new_extra = extra reqs = dm . pop ( extra ) new_extra , _ , marker = extra . partition ( ':' ) fails_marker = marker and ( invalid_marker ( marker ) or not evaluate_marker ( marker ) ) if fails_marker : reqs = [ ] new_extra = safe_extra ( new_extra ) or None dm . setdefault ( new_extra , [ ] ) . extend ( reqs ) return dm