fileinput 简单操作

import fileinput

with fileinput.input('a.txt') as f:  # , backup=".bak", inplace=1 backup inplace 同时有参数才会备份
    print("*****访问一个文件 'a.txt'****")
    for line in f:
        print(line.strip()) # print(line.strip(), ' # ', f.lineno())
    # f.close()

with fileinput.input(('a.txt', 'b.txt')) as f:
    print("---访问两个文件 'a.txt', 'b.txt' ---")
    for line in f:
        print(f.lineno(), '.', f.filename(), '--->', f.filelineno(), line.strip())