Raspberry PI 3+ python blinking LED

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I've recently been getting into the raspberry PI world. I have a model 3+ that one of my first projects was to get an LED to blink. The following below will make an LED blink for a random amount of time for a random amount of times. 
 import RPi.GPIO as GPIO  
 import time  
 import random  
 from random import *  
 # set the output mode of the GPIO pins  
 GPIO.setmode(GPIO.BCM)  
 # don't show warnings in the console  
 GPIO.setwarnings(False)  
 # this sets the output to pin 18 (positive)  
 GPIO.setup(18,GPIO.OUT)  
 # we randomly pick some numbers  
 numberOfBlinks = randint(10,30)  
 blinkLength = randint(1,5)  
 print(numberOfBlinks,blinkLength)  
 print("LEDs on")  
 counter = 0  
 # loop through and turn the LED on and off  
 while counter <= numberOfBlinks:  
   # set the output to high (ON)  
   GPIO.output(18,GPIO.HIGH)  
   # wait for X seconds  
   time.sleep(blinkLength)  
   # set the output to low (OFF)  
   GPIO.output(18,GPIO.LOW)  
   counter = counter + 1  
   print(counter)  
 print("LEDs off")

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