Simple Python program to flash onboard LED of Arduino UNO. Requires pyfirmata.

blink.py

from pyfirmata import Arduino, util
import time

board = Arduino("COM3")

loopTimes = input('How many times would you like the LED to blink: ')
print("Blinking " + loopTimes + " times.")

for x in range(int(loopTimes)):

	board.digital[13].write(1)
	time.sleep(0.2)
	board.digital[13].write(0)
	time.sleep(0.2)

from pyfirmata import Arduino, util
import time

// WINDOWS
board = Arduino("COM3")
//LINUX
//board = Arduino("/dev/ttyACM0")

loopTimes = input('How many times would you like the LED to blink: ')
print("Blinking %d times.", loopTimes)

for x in range(int(loopTimes)):

board.digital[13].write(1)
time.sleep(0.2)
board.digital[13].write(0)
time.sleep(0.2)