Backwards compatible interface.

    Call readmodule_ex() and then only keep Class objects from the
    resulting dictionary.

def readmodule(module, path=None):
    '''Backwards compatible interface.

    Call readmodule_ex() and then only keep Class objects from the
    resulting dictionary.'''

    res = {}
    for key, value in _readmodule(module, path or []).items():
        if isinstance(value, Class):
            res[key] = value
    return res