python 文本每行后面加,

#encoding:utf-8

lines = None
with open("/Users/apple/Desktop/a.txt", "r") as f:
    #s.strip(rm)是指删除字符串s开头和结尾的的rm字符；line.strip()是指删除line开头和结尾的空白符（包括'\n', '\r',  '\t',  ' ')
    lines = [line.strip()+",\n" for line in f.readlines()]
with open("/Users/apple/Desktop/a.txt", "w") as f:
    f.writelines(lines)