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GeezerVison is showing github.com — python_test/test28.py at master · zhangyfzone/python_test

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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
'练习读取文件'
__author__ = 'sergiojune'
# 默认编码方式是gbk,而编译器是utf-8,所以需要指定编码方式
f = open('./test27.py', 'r', encoding='utf-8')
# 读取文件全部内容,有一个参数为读取文件的大小
# 当文件较小时可以这样读
# txt = f. read()
# print(txt)
# 还可以这样一行一行读
print(f.readline())
# 以一行行形式读全部内容
for line in f.readlines():
print(line)
# 最后记得关闭文件
f.close()
# 当文件出现异常时,或许关闭不了文件,就需要捕捉异常
try:
f = open('./test26.py', 'r', encoding='utf-8')
for x in f.readlines():
print(x)
except IOError as e:
print(e)
finally:
# 最后一定关闭
if f:
f.close()
# 如果每次都需要这样捕捉异常,就会很麻烦,python中可以用with语句块来处理
with open('./test27.py', 'r', encoding='utf-8') as f:
# 当离开这个语句块就会自动关闭,就不需要我们来关闭
txt = f.read()
print(txt)
# 作业:请将本地一个文本文件读为一个str并打印出来
# 上面的就是了,参考上面的
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