Python 3.x 如何通过用户输入打开文件？

这就是我到目前为止所尝试的：

print('''You will have to enter a file name
Once the file name has been entered, the program will then print out your ASCII art''')
file_name = input('Enter file name: ')
with open(file_name) as file_handle:
    for line in file_handle:
        for x in f:
            print(x)

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一个for循环应该按照注释从代码中删除，并且应该打印行

print('''You will have to enter a file name
Once the file name has been entered, the program will then print out your ASCII art''')
file_name = input('Enter file name: ')
with open(file_name) as file_handle:
    for line in file_handle:
        #for x in f:
        print(line)