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()方法被反複調用。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衝器。

語法

以下是next()方法的語法：

fileObject.next(); 

參數

• NA

返回值

此方法返回下一個輸入行。

例子

下麵的示例演示next()方法的使用。

#!/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()

當我們運行上麵的程序，它會產生以下結果：

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