python读写read(),readline,readlines

1.read()每次读取整个文件，通常用于将一个文件内容放到一个字符串中。但是当文件内容过大时，则不可行，并且当按行读取文件时也不适合。2.readline()每次读取一行，占用内存小，适合读大文件。

#coding:utf-8
#python2.7
f = open('1.txt','r')
result = list()
for line in f:
line = f.readline()
print line  #do something you want

3.readlines每次读取整个文件。

#coding:utf-8#python2.7f = open('1.txt','r')result = list()for line in f.readlines():#do something you wantresult.append(line)print resultopen('1.txt','w').write('%s' % '\n'.join(result))

4.另外一种读文件的方式：

#coding:utf-8#python2.7f = open('1.txt','r')result = list()for line in f:print line #do something you want

这种方式和readline相比，直接省去了f.readline()这一行参考文章：1.http://blog.csdn.net/werm520/article/details/68984732.http://www.cnblogs.com/xuxn/archive/2011/07/27/read-a-file-with-python.html