python第九期学习笔记（三）

读文件操作案例：

#!/usr/bin/python3
#_*_ coding:utf-8 _*_
#author:inwell
#Time:2019/10/15 16:14

# f=open("1_homework.py",mode="r",encoding="utf-8")
# #读取前10个字符
# msg=f.read(10)
# #读取10个字符以后的字符
# msg1=f.read()
# print(msg)
# print(msg1)
# f.close()

# f=open("02 format.py",mode="r",encoding="utf-8")
# readline()一次只读取一行内容
# msg1=f.readline()
# msg2=f.readline()
# msg3=f.readline()
# msg4=f.readline()
# print(msg1)
# print(msg2)
# print(msg3)
# print(msg4)
# f.close()

f=open("02 format.py",mode="r",encoding="utf-8")
#readlines()返回一个列表，列表里面每个元素是原文件的每一行，如果文件很大，占内存，容易崩盘
msg=f.readlines()
print(msg)

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写文件操作：