I wanted to try making a simple proof of work program

hasher.py

from hashlib import sha256
import time


def hasher(challenge_phrase:str, zero_count: int =0 ):
    nonce = 0
    zeros = 0
    zero_string = "0" * zero_count
    while zeros != zero_count:
        h = sha256(str(challenge_phrase + str(nonce)).encode("utf8"))
        digest = h.hexdigest()
        if digest[:zero_count] == zero_string:
            print(digest)
            break
        nonce += 1
    return nonce


CHALLENGE = "1234567"
for x in range(7):
    print(hasher(CHALLENGE, x))
    print(time.asctime())