next()方法當一個文件被用作迭代器,典型例子是在一個循環中被使用,next()方法被反復調用。此方法返回下一個輸入行,或引發StopIteration異常EOF時被命中。
與其它文件的方法,如ReadLine()相結合next()方法工作不正常。然而,usingseek()將文件重新定位到一個絕對位置將刷新預讀緩沖器。
語法
以下是next()方法的語法:
fileObject.next();
參數
返回值
此方法返回下一個輸入行。
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()當我們運行上面的程序,它會產生以下結果:
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
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