next()方法當(dāng)一個(gè)文件被用作迭代器，典型例子是在一個(gè)循環(huán)中被使用，next()方法被反復(fù)調(diào)用。此方法返回下一個(gè)輸入行，或引發(fā)StopIteration異常EOF時(shí)被命中。

與其它文件的方法，如ReadLine()相結(jié)合next()方法工作不正常。然而，usingseek()將文件重新定位到一個(gè)絕對(duì)位置將刷新預(yù)讀緩沖器。
語法

以下是next()方法的語法：

fileObject.next(); 

參數(shù)

返回值

此方法返回下一個(gè)輸入行。
例子

下面的示例演示next()方法的使用。

#!/usr/bin/python# Open a filefo = open("foo.txt", "rw+")print "Name of the file: ", fo.name# Assuming file has following 5 lines# This is 1st line# This is 2nd line# This is 3rd line# This is 4th line# This is 5th linefor index in range(5):  line = fo.next()  print "Line No %d - %s" % (index, line)# Close opend filefo.close()

當(dāng)我們運(yùn)行上面的程序，它會(huì)產(chǎn)生以下結(jié)果：

Name of the file: foo.txtLine No 0 - This is 1st lineLine No 1 - This is 2nd lineLine No 2 - This is 3rd lineLine No 3 - This is 4th lineLine No 4 - This is 5th line