Python 3 - File next() Method

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Description

File object in Python 3 doesn't support next() method. Python 3 has a built-in function next() which retrieves the next item from the iterator by calling its __next__() method. If default is given, it is returned if the iterator is exhausted, otherwise StopIteration is raised. This method can be used to read the next input line, from the file object

Syntax

Following is the syntax for next() method −

next(iterator[,default])

Parameters

• iterator − file object from which lines are to be read

• default − returned if iterator exhausted. If not given, StopIteration is raised

Return Value

This method returns the next input line.

Example

The following example shows the usage of next() method.

Assuming that 'foo.txt' contains following lines
C++
Java
Python
Perl
PHP

#!/usr/bin/python3

# Open a file
fo = open("foo.txt", "r")
print ("Name of the file: ", fo.name)

for index in range(5):
   line = next(fo)
   print ("Line No %d - %s" % (index, line))

# Close opened file
fo.close()

Result

When we run the above program, it produces the following result −

Name of the file:  foo.txt
Line No 0 - C++

Line No 1 - Java

Line No 2 - Python

Line No 3 - Perl

Line No 4 - PHP