python文件读写

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 s
fnew.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.flush
f1.close()