import random
with open(r'C:\Users\admin\Desktop\1.txt', 'r') as txt:
for i in txt.readlines():
with open(r'C:\Users\admin\Desktop\2.txt', 'a') as txt1:
write = ''.join([i.split('\n')[0], str(random.randint(1, 100)), '\n'])
txt1.write(write)
保存在另外一个文件,在修改文件的时候尽量不要在源文件里改,这样错误了还能回去