fileinput.lineno() in Python

With the help of fileinput.lineno() method, we can get the line number for every line on line read from input file by using fileinput.lineno() method.

Syntax : fileinput.lineno()

Return : Return the line number.

Example #1 :
In this example we can see that by using fileinput.lineno() method, we are able to get the line number for every line read from the given file by using this method.

Input File –

# import fileinput
import fileinput

# Using fileinput.lineno() method
for line in fileinput.input(files ='gfg.txt'):
    print('{}. '.format(fileinput.lineno()) + line)

Output :


Example #2 :

Input File –

# import fileinput
import fileinput

# Using fileinput.lineno() method
for line in fileinput.input(files =('gfg.txt', 'gfg1.txt')):
    print('{}. '.format(fileinput.lineno()) + line)

Output :