Python主要错误

Question

import sys

def Cat(filename):

    f = open(filename,'rU')
    text = f.read()
    print ("text")
    f.close()

    def main():
        Cat(sys.argv[1])  

if __name__ == '__main__':
    main()

我不断收到如下所示的错误:

NameError: name 'main' is not defined.

Answer 1

main 没有正确缩进。它不应该有缩进。现在只能从 Cat 访问它。

import sys

def Cat(filename):

    f = open(filename,'rU')
    text = f.read()
    print ("text")
    f.close()

def main():
    Cat(sys.argv[1])  

if __name__ == '__main__':
    main()