Function _try_add

lib/matplotlib/font_manager.py:606–611

(name, subfam)

        return 400  # "Regular" or unrecognised

    def _try_add(name, subfam):
        name = name.strip()
        if not name or name in seen:
            return
        seen.add(name)
        result.append((name, _weight_from_subfam(subfam.strip())))

    # Each family-name ID is paired with its corresponding subfamily ID on the
    # same platform: (family_id, subfamily_id).