#!/usr/bin/python
# encoding: utf8

#with 语句不只是针对文件而言的，它是一个用来创建运行时环境的通用框架（genericframework）,告诉对象它们正在进入和离开一个运行时环境。

print '\u9fa5'
print '\u003f'
#创建文件并写入内容
with open('test.txt',mode='w') as a_file:
	a_file.write('test successd')
	print(a_file.mode)
	print(a_file.name)

with open('test.log', mode='w') as b_file:
	b_file.write('xxxooo=') 
#读取文件内容
with open('t.txt') as c_file:
	print(c_file.read()) 
	print(c_file.seek(1)) #seek()方法使定位到文件中的特定字节
	print(c_file.read(10))#参数表示所读字符的个数
	print(c_file.tell())
#在文件后追加内容
with open('test.txt',mode='a') as a_file:
	a_file.write('and xxx ooo  successd')

with open('test.txt') as d_file:
	print(d_file.read()) 
#一次读取一行，并打印出行号和数据
print '-----------'
line_number = 0
with open('t.txt') as e_file:
	for a_line in e_file:
		line_number += 1
		print '{0}{1}'.format(line_number,a_line.rstrip())


#二进制文件
an_image = open('ttt.png', mode='rb')
print (an_image.mode)
print(an_image.name)
print(an_image.encoding)

print(an_image.tell())   # 0
data = an_image.read(3)  #N
print (data)
print (type(data))  #str ??
data = an_image.read()
print(len(data))