正在检查文件中与输入匹配的文本

你可以利用 for...else python拥有的构造。

with open("username") as f:
    for line in f:
        if username in line:
            print("correct")
            break
    else:
        print("incorrect")

else 如果程序自然退出,则会运行块,而不会中断循环。

如果你不喜欢传统 for 循环,那么我建议您使用以下解决方案:

with open("username") as f:
    isInList = [username in line for line in f]:
    if any(isInList):
        print ("correct")
    else:
        print("incorrect")

with Here 是关于 陈述

username = input("enter username: ")
def read_file():
    with open("username", "r") as f:
        for line in f:
            if username in line:
                return "correct"
        else:
            return "incorrect"
result = read_file()
print(result)
# Or do whatever else you want with the result