python中的文件读写操作

python中如何对文件进行读写操作?针对这个问题,今天小编总结这篇有关文件读写的文章,希望能帮助更多想解决这个问题的朋友找到更加简单易行的办法。

站在用户的角度思考问题,与客户深入沟通,找到图们网站设计与图们网站推广的解决方案,凭借多年的经验,让设计与互联网技术结合,创造个性化、用户体验好的作品,建站类型包括:网站设计、成都网站建设、企业官网、英文网站、手机端网站、网站推广、申请域名虚拟主机、企业邮箱。业务覆盖图们地区。

open(filemode='r'buffering=-1encoding=Noneerrors=Nonenewline=Noneclosefd=Trueopener=None)

CharacterMeaning
'r'open for reading (default)
'w'open for writing, truncating the file first
'x'open for exclusive creation, failing if the file already exists
'a'open for writing, appending to the end of the file if it exists
'b'binary mode
't'text mode (default)
'+'open a disk file for updating (reading and writing)
'U'universal newlines mode (deprecated)

The default mode is 'r' (open for reading text, synonym of 'rt'). For binary read-write access, the mode 'w+b' opens and truncates the file to 0 bytes. 'r+b' opens the file without truncation.

文本读写操作:open(), close(), read(), readlines(),  

一、普通操作,open(),read(),close()

#!/usr/bin/python
#coding=utf-8

import logging

try:
	f = open('/home/seeing-zynq/Documents/Temp/Test/mydict.py', 'r')
	print f.read();
	print 'read'
except Exception as e:
	logging.exception(e)
	print 'error'
	raise 
finally:
	if f:
		f.close()
		print 'OK'

运行结果:

#!/usr/bin/python
# -*- coding: utf-8 -*-

class Dict(dict):

    def __init__(self, **kw):
        super().__init__(**kw)

    def __getattr__(self, key):
        try:
            return self[key]
        except KeyError:
            raise AttributeError(r"'Dict' object has no attribute '%s'" % key)

    def __setattr__(self, key, value):
        self[key] = value





read
OK

二、read()完后自动close()

with open('/home/seeing-zynq/Documents/Temp/Test/mydict.py', 'r') as f:    
	print (f.read())

运行结果:

#!/usr/bin/python
# -*- coding: utf-8 -*-

class Dict(dict):

    def __init__(self, **kw):
        super().__init__(**kw)

    def __getattr__(self, key):
        try:
            return self[key]
        except KeyError:
            raise AttributeError(r"'Dict' object has no attribute '%s'" % key)

    def __setattr__(self, key, value):
        self[key] = value

三、为避免read()未知容量的大文件,保险起见用readlines().

print '------------------------------------'
print '-----------------------------------'
f = open('/home/seeing-zynq/Documents/Temp/Test/mydict.py', 'r')
for line in f.readlines():
    print(line.strip())  ##strip会将前面首字符前的空格去掉,造成行句没有缩进
f.close()
print 'over'

运行结果:

------------------------------------
-----------------------------------
#!/usr/bin/python
# -*- coding: utf-8 -*-

class Dict(dict):

def __init__(self, **kw):
super().__init__(**kw)

def __getattr__(self, key):
try:
return self[key]
except KeyError:
raise AttributeError(r"'Dict' object has no attribute '%s'" % key)

def __setattr__(self, key, value):
self[key] = value




over

四、读二进制文件,如图片,视频等

>>> f = open('/Users/michael/test.jpg', 'rb')
>>> f.read()
b'\xff\xd8\xff\xe1\x00\x18Exif\x00\x00...' # 十六进制表示的字节

五、write()

with open('/home/seeing-zynq/Documents/Temp/IO/a.txt', 'w') as f:   
    f.write('haha')

with open('/home/seeing-zynq/Documents/Temp/IO/a.txt', 'r') as f:  
    print (f.read())
"file.py" 37L, 758C wri

运行结果:

haha

看完上述内容,你们对python中的文件读写操作大概了解了吗?如果想了解更多相关文章内容,欢迎关注创新互联行业资讯频道,感谢各位的阅读!


网页名称:python中的文件读写操作
URL网址:http://pwwzsj.com/article/jjjoie.html