usage.py 文件源码

def getSynopsis(self):
        """ Returns a string containing a description of these options and how to
            pass them to the executed file.
        """

        default = "%s%s" % (path.basename(sys.argv[0]),
                            (self.longOpt and " [options]") or '')
        if self.parent is None:
            default = "Usage: %s%s" % (path.basename(sys.argv[0]),
                                       (self.longOpt and " [options]") or '')
        else:
            default = '%s' % ((self.longOpt and "[options]") or '')
        synopsis = getattr(self, "synopsis", default)

        synopsis = synopsis.rstrip()

        if self.parent is not None:
            synopsis = ' '.join((self.parent.getSynopsis(), self.parent.subCommand, synopsis))

        return synopsis