def tick(self):
        """Return the time cost string as expect."""
        string = self.passed
        if self.rounding:
            string = round(string)
        if self.readable:
            string = self.readable(string)
        return string
def tick ( self ) : string = self . passed if self . rounding : string = round ( string ) if self . readable : string = self . readable ( string ) return string
Return the time cost string as expect.