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python - 我希望输出在 for 循环中显示一次

问题描述

如果错误，我希望 Else 语句显示一次。请查看我尝试过的代码。

lists = ['apple','grape','pineapple','orange']

password = "xyz"
def pass1():
    for i in lists:
        if i == password:
            print("Accepted!", "Password : " + i)
            break
        else:
            print("Password not found! Try again")
pass1()

输出：

Password not found! Try again
Password not found! Try again
Password not found! Try again
Password not found! Try again

Process finished with exit code 0

标签： python

解决方案

如果我正确理解您的问题，您可以通过删除else, 如果循环结束并且您没有在列表中找到密码，则它不存在。

lists = ['apple','grape','pineapple','orange']

password = "xyz"
def pass1():
    for i in lists:
        if i == password:
            print("Accepted!", "Password : " + i)
            return
    print("Password not found! Try again")
pass1()

另一种更蟒蛇的方式

def pass2():
    if password in lists:
        print(print("Accepted!", "Password : " + lists.index(password)))
    else:
        print("Password not found! Try again")
pass2()

我不明白您为什么不将密码作为参数传递？

也许考虑这样做如下

def pass3(password, lists):
    if password in lists:
        print(print("Accepted!", "Password : " + lists.index(password)))
    else:
        print("Password not found! Try again")

lists = ['apple','grape','pineapple','orange']
password = "xyz"
pass3(password, lists)

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