python 读取文件

#!/usr/bin/python2.6  
# -*- coding: utf-8 -*- 
fh=open('d:\sql.txt','w+')	
for i in range(1,5):
	Contents="'insert org values(0,'PROV','%d',1,1)'"%i
	#%d为数字，%s为字符串。
	fh.write(Contents+'\n')
	fh.write(Contents+'\n')
fh.close()


fh2=open('d:\sql.txt','r')
print "========普通读取"
for i in fh2:
	print i
fh2.close()

print "========read读取"
with open('d:\sql.txt','r') as f:
	print f.read()

fh3=open('d:\sql.txt','r')
print "========readlines读取"
for line in fh3.readlines():
	print line
fh3.close()
	
fh4=open('d:\sql.txt','r')
print "========readline读取"
print fh4.readline()
fh4.close()



with open('d:\sql.txt','r') as f:
	print f.readlines()

##w+是每次打开前会清空文本一次，之后添加的文本追加模式。a是打开直接追加。r读取
#with为自动执行close关闭。
#read一次性读取所有到内存，文件过大就会内存溢出。readline读一行。readlines一次性读出成一个list