Raspberry Pi time lapse program. Keeps images in order without timestamp

Pi Time Lapse.py

# Using library at http://pimylifeup.com/raspberry-pi-time-lapse/
from glob import glob
import os.path
import subprocess, logging


FILE_PATH = "/home/pi/timelapse/"  # Where to store the files
CAPTURE_COMMAND = "raspistill -o {0}"  # To be formatted later with file name
FORMAT = "[%(levelname)s] %(message)s"
LOG_FILE = FILE_PATH + "log.txt"
logging.basicConfig(format=FORMAT, filename=LOG_FILE, level=logging.DEBUG)


logging.info("Starting capture of image...")


files = glob(FILE_PATH + "*")  # Get a list of files in the directory
file_index = 0
while True:
	file_name = FILE_PATH + str(file_index) + ".jpg"
	if os.path.isfile(file_name) and file_name in files:  # Double check file exists, just in case
		file_index += 1
	else: 
		break  # If there is no file by that name, then we can save to it


final_path = FILE_PATH + str(file_index) + ".jpg"
logging.info("Found image slot at " + final_path)
command = CAPTURE_COMMAND.format(final_path)  # Build the string command


retry_count = 5
while retry_count != 0:
	logging.info("Executing command '{0}'".format(command))
	output = subprocess.check_output(command, shell=True)  # Run the command to capture the images
	logging.debug("Got output " + output)

	if os.path.isfile(final_path):  # Check that the file does exist
		logging.info("File Saved successfully to " + final_path)
		break
	else:
		logging.error("Something went wrong saving the file, retrying...")
		retry_count -= 1


if retry_count == 0:
	exit(1)  # Tell the computer something went wrong
else:
	exit(0)  # Exit with no errors