Raspberry pi camera module time-delayed loop.

timed_capture.py

#!/usr/bin/env python
'''
Usage:
python timed_capture.py
'''
import datetime
from time import sleep
import subprocess

fps = 1 # The number of frames to capture per second.
total_dur = 10 # The total capture time.

'''
The settings above capture 1 frame every second and runs
for a total of 10 seconds. Afterwards you'll have 10 images
captured 1 second apart from each other
'''

for x in range(total_dur):
    current_time = str(datetime.datetime.now())
    file_name = current_time.replace(' ', '_') + '.jpg'
    subprocess.call(['raspistill', '-o', file_name, '-n'])
    sleep(fps)