python 文件操作

#coding=utf-8

#
# 文件 操作
#

# w; r; rb; b; a(追加模式); w+; r+

file = open(r'E:\py_code\1234.txt', 'w+')
#print file
file.write('123')
file.close()

file = open(r'E:\py_code\1234.txt', 'r+')
#print file
print file.read(10)
file.close()


#管道
import sys
#text = sys.stdin.read()
#words = text.split()
#wordcount = len(words)
#print 'wordcount', wordcount

##Linux 命令
#cat  操作文件 | python 当前代码文件 | sort
# 上面代码统计单词

#基本用法
file = open(r'E:\py_code\test.txt')
print file.read(10)                   # 字节读取
print file.read()
file.close()

#readline 用法； 行读取
file = open(r'E:\py_code\test.txt')
for i in range(3):
	print str(i) + ':' + file.readline()
file.close()
	
#writelines 用法
file = open(r'E:\py_code\test.txt', 'w')
file.writelines('i like your face')               # 会清空，写入
file.close()

#文件对象迭代
def process(string):
	print 'c:', string
def show(filename):
	file = open(filename)
	if True:
		#while True:
		#	char = file.read(1)
		#	if not char:break
		#	process(char)
		for line in file.readlines():
			process(line)		
	else:
		#char = file.read(1)
		#while char:
		#	process(char)
		#	char = file.read(1)
		for char in file.read():
			process(char)
	file.close
	
show(r'E:\py_code\test.txt')