python入门-文件

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1 读取文件

with open('1.txt') as file_ojbect:
contents = file_ojbect.read()
print(contents.rstrip())

with 自动体会文件的关闭

open 打开文件，然后返回一个文件对象

把结果放到变量中，然后打印去掉右边空行的变量

其他几个读取文件的用法

with open('1.txt') as file_ojbect:
for line in file_ojbect:
print(line.rstrip())filename = '1.txt'
with open(filename) as file_ojbect:
lines = file_ojbect.readlines()for line in lines:
print(line.rstrip())filename = '1.txt'
with open(filename) as file_ojbect:
lines = file_ojbect.readlines()pi_string=''
for line in lines:
pi_string +=line.strip()print(pi_string)
print(len(pi_string))

2 写入文件

filename = '3.txt'
with open(filename,'w') as file_ojbect:
file_ojbect.write("I love programming.\n")
file_ojbect.write("I love creating new games.\n")

打开文件然后写入如下内容

3 追加文件

filename = '3.txt'
with open(filename,'a') as file_ojbect:
file_ojbect.write("I love studying.\n")
file_ojbect.write("I love playing games.\n")

打开文件然后追加如下内容