import time
import picamera
from datetime import datetime, timedelta
import os

with picamera.PiCamera() as camera:
        camera.resolution = (1024, 768)
        camera.hflip= True
        camera.vflip= True
        #filepath = '/home/pi/camera/'
        filepath = '/run/shm/'
        filedate = time.strftime("%Y-%m-%d-%H-%M-%S")
        filename = filepath+'RPI_cam_'+filedate+'.jpg'
        lastfilename=filepath+'last.jpg'
        camera.start_preview()
        # Camera warm-up time
        time.sleep(2)
        #camera.capture(filename, resize=(640, 480))
        camera.capture(filename, resize=(640, 480))
        try:
            os.remove(lastfilename)
        except:
            pass
        os.symlink(filename,lastfilename)
pass