python文件读写

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python读文件

1、读取整个文件

# -*- coding: utf-8 -*-#python进行文件读写的函数是open或file#fo = open('d:/devSpace/code/python/test.txt')#print fo.read()#fo.close()f1 = file('d:/devSpace/code/python/test.txt')print f1.read()f1.close()

2、逐行读取

#f1 = open('d:/devSpace/code/python/test.txt')#s = f1.readline()#print s#s = f1.readline()#print s#s = f1.readline()#print s#f1 = open('d:/devSpace/code/python/test.txt')#lines = f1.readlines()#for line in lines:#   print line#f1.close()#f1 = open('d:/devSpace/code/python/test.txt')#print f1.next()#print f1.next()#print f1.next()

3、seek函数（确定文件读写的指针)

#f1 = file('d:/devSpace/code/python/test.txt', 'r+')#f1.seek(0,0)#print f1.read()#f1 = file('d:/devSpace/code/python/test.txt', 'r+')#f1.seek(0,1)#print f1.read()f1 = file('d:/devSpace/code/python/test.txt', 'r+')f1.seek(0,2)print f1.read()

python写文件

1、写整个文件

# -*- coding: utf-8 -*-#'w'模式下写入，如果原来的文件中有内容，则会删除原先的内容再重新写入#fnew = open('d:/devSpace/code/python/new.txt', 'w')#fnew.write('hello \ni am new')#fnew.close()#fnew = open('d:/devSpace/code/python/new.txt', 'w')#fnew.write('i am new')#fnew.close()fnew = open('d:/devSpace/code/python/new.txt', 'r+')s = fnew.read()print sfnew.close()#fnew = open('d:/devSpace/code/python/new.txt', 'r+')#fnew.write('\n新内容')#fnew.close()

2、逐行写入

l = ['111\n', '222\n', '333\n']f1 = open('test.txt', 'a')f1.writelines(l)f1.flushf1.close()

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