python中的文件讀寫操作

python中如何對文件進行讀寫操作？針對這個問題，今天小編總結(jié)這篇有關(guān)文件讀寫的文章，希望能幫助更多想解決這個問題的朋友找到更加簡單易行的辦法。

open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None, closefd=True, opener=None)

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.

文本讀寫操作：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'

運行結(jié)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()完后自動close()

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

運行結(jié)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、為避免read()未知容量的大文件，保險起見用readlines().

print '------------------------------------'
print '-----------------------------------'
f = open('/home/seeing-zynq/Documents/Temp/Test/mydict.py', 'r')
for line in f.readlines():
    print(line.strip())  ##strip會將前面首字符前的空格去掉，造成行句沒有縮進
f.close()
print 'over'

運行結(jié)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、讀二進制文件，如圖片，視頻等

>>> f = open('/Users/michael/test.jpg', 'rb')
>>> f.read()
b'\xff\xd8\xff\xe1\x00\x18Exif\x00\x00...' # 十六進制表示的字節(jié)

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

運行結(jié)果：

haha

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