Friday, July 24, 2020

Python File readline() Method with example



Hello dear readers! Welcome back to another section of my tutorial on Python. In this tutorial guide, we are going to be studying about Python File readline() method.

The Python file readline() method reads 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 that includes the trailing newline and a partial line may be returned.

An empty string is returned back only when EOF is hit immidiately.

Syntax

The following below is the syntax for Python File readline() method -

fileObject.readline( size );


Parameter Details

  • size - Number of bytes to be read from the file.

Return Value

It returns the line read from the file.

Example

The following below is a simple example -

This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

#!/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

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

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

# Close opend file
fo.close()

Output
When the above code is executed, it will produce the following result -

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

Read Line: This 


Alright guys! This is where we are rounding up for this tutorial post. In my next tutorial, we are going to be studying about the Python File readlines Method.

Feel free to ask your questions where necessary and i will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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Thanks for reading and bye for now.
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