输入任意单字符n次，只要能在键盘上打出来的字符都可以

def Char(self, char, n = 1, dl = 0):
        """输入任意单字符n次，只要能在键盘上打出来的字符都可以
        """
        if len(char) == 1:
            self.Delay(dl)
            self.keyboard.tap_key(char)
        else:
            raise Exception("""method "Char()" can only take one character.""")