python - input()用戶輸入的值不合法則要求從新輸入

其實實現這個功能很是簡單, 只須要使用一個while循環就行了, 若是知足條件就break跳出循環. 示例代碼以下:

#input and judge gender
while True:
    gender = input("Please input your gender (m for male, f for female):")
    if(gender =='m' or gender == 'f'):
        break
    else:
        print("Error! you must input a valid letter!Please try again!\n")
        continue
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