這篇文章主要介紹了在Python中使用next()方法操作文件的教程,是Python入門中的基礎知識,需要的朋友可以參考下
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:
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1 fileObject.next();參數
NA
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。
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 #!/usr/bin/python # Open a file fo = 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 line for index in range(5): line = fo.next() print "Line No %d - %s" % (index, line) # Close opend file fo.close()當我們運行上面的程序,它會產生以下結果:
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1 2 3 4 5 6 7 8 9 10 Name of the file: foo.txt Line No 0 - This is 1st line Line No 1 - This is 2nd line Line No 2 - This is 3rd line Line No 3 - This is 4th line Line No 4 - This is 5th line