读取文件内容

利用for循环按行读取文件

import sys

input_file = sys.argv[1]
fileread = open(input_file, 'r', encoding='UTF-8')
line_number = 0
for a in fileread:
    line_number += 1
    print(line_number, a, end='
')
fileread.close()

encoding=‘UTF-8’ 可以避免出现如下错误：

UnicodeDecodeError: 'gbk' codec can't decode byte 0x81 in position 282: illegal multibyte sequence　　

利用while循环读取，按行读取文件

import sys

input_file = sys.argv[1]
fileread = open(input_file, 'r', encoding='UTF-8')
line_number = 0
while True:
    line_number += 1
    line = fileread.readline()
    if line == '':
        break
    print(line_number, line, end='
')
fileread.close()