How do i keep track of the blocks i generated?

Question

So i've written up a "md5 hash generator":

import time
from datetime import datetime
import random

print("Dash Mining Software")

def miner():
  while True:
    hash = random.getrandbits(128)
    print("Dash > ", datetime.now(), "%032x" % hash)
    time.sleep(1.5)

miner()

and i want before the hash to say block 1 and store it in a var so when ever i start my script it remembers the block in was on and con continues the process.

Can anybody help me?