Every time it executes, take a picture with 1 added file name

raspi_photo.py

import subprocess
import os

def take_picture(file_name):
    print('raspistill')

    args = ['raspistill', '-o', file_name]
    res = subprocess.check_call(args)
    print(res)

# exist file?

number = 1

while True:
    number_padded = '%06d' % number
    print(number_padded)

    #path = './raspi_photo.py'
    #path = './raspi_photo1.py'
    path = number_padded + '.jpg'

    if os.path.exists(path) == False:
        take_picture(path)
        break

    number += 1