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Python File readline() Method


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Description:

This method read one entire line from the file. A trailing newline character is kept in the string. If the size argument is present and non-negative, it is a maximum byte count including the trailing newline and an incomplete line may be returned.

An empty string is returned only when EOF is encountered immediately.

Syntax:

fileObject.readline( size ); 

Parameters:

Here is the detail of parameters:

  • size: This is the number of bytes to be read from the file.

Example:

#!/usr/bin/python

# Open a file
fo = open("foo.txt", "r")
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

line = fo.readline()
print "Read Line: %s" % (line)

line = fo.readline(5)
print "Read Line: %s" % (line)

# Close opend file
fo.close()

This produces following result:

Name of the file:  foo.txt
Read Line: This is 1st line

Read Line: This


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