File readline() Method

File readline( ) Method in Python 3

 The method readline()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 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

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

Return Value

   This method returns the line read from the file.

Example

Assuming that 'foo.txt' file contains following text- This is 1st line This is 2nd line This is 3rd line This is 4th line This is 5th line

#!/usr/bin/python3 # Open a file fo = open("foo.txt", "r+") print ("Name of the file: ", fo.name) line = fo.readline() print ("Read Line: %s" % (line)) line = fo.readline(5) print ("Read Line: %s" % (line)) # Close opened file fo.close()

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

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