How to loop back to the beginning of a programme - Python
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我在python 3.4中编写了一个BMI计算器,最后我想询问用户是否想再次使用计算器,如果是,则返回到代码的开头。 到目前为止我已经有了这个。 非常欢迎任何帮助:-)
1 2 3 4 5 6 7 8 9 10 | #Asks if the user would like to use the calculator again again =input("Thank you again for using this calculator, would you like to try again? Please type y for yes or n for no-") while(again !="n") and (again !="y"): again =input("Please type a valid response. Would you like to try again? Please type y for yes or n for no-") if again =="n" : print("Thank you, bye!") elif again =="y" : |
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将整个代码包装成循环:
1 | while True: |
每隔一行缩进4个字符。
每当您想"从头重新开始"时,请使用statement
1 | continue |
无论何时想要终止循环并继续循环,都要使用
1 | break |
如果要终止整个程序,在代码开头
1 | sys.exit() |
如果用户想要再次启动,您只需要调用该函数:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | def calculate(): # do work return play_again() def play_again(): while True: again = input("Thank you again for using this calculator, would you like to try again? Please type y for yes or n for no-") if again not in {"y","n"}: print("please enter valid input") elif again =="n": return"Thank you, bye!" elif again =="y": # call function to start the calc again return calculate() calculate() |