1、测试数据及脚本
root@DESKTOP-1N42TVH:/home/test# ls
test.py test.txt
root@DESKTOP-1N42TVH:/home/test# cat test.txt
a 3 d
s 1 j
z c m
q e i
3 4 k
h f 3
root@DESKTOP-1N42TVH:/home/test# cat test.py
fp=open("test.txt","r")
file=open("result.txt","w")
for i in range(3): ## 提取前三行
file.write(fp.readline().strip())
file.write("\n")
fp.close()
file.close()
root@DESKTOP-1N42TVH:/home/test# python3 test.py
root@DESKTOP-1N42TVH:/home/test# ls
result.txt test.py test.txt
root@DESKTOP-1N42TVH:/home/test# cat result.txt ## 查看结果
a 3 d
s 1 j
z c m