how can I generate a password in hashlib

[buran]

why do you need to complicate things that much? And you want the hash to be the key, not other way around.

import hashlib

rainbow_dict = {}
for i in range(1000, 10000): # note you need upper end to be 10000 in odrder to include 9999
    my_hash = hashlib.sha256(str(i).encode()).hexdigest()
    rainbow_dict[my_hash] = i

# or replace lines 3-7 with a single line    
#rainbow_dict = {hashlib.sha256(str(i).encode()).hexdigest():i for i in range(1000, 10000)}
 
# sample with 3 random hashes 
passwords = ['c56b05eb525718f02df539e071361dd58b168a5a70abdb3148d44f98c46c38cd',
             'f476ef220e571593579ae60582fe52a888309b21d4a01cf1cd56a14084d9db27',
             '1828526428f17576e6581a0b9c893ecf79c1fdc20f495f0bdc98b559b25b92a6']
          
for password_hash in passwords:
    print(f'{password_hash} --> {rainbow_dict[password_hash]}')
    
print(hashlib.sha256('2523'.encode()).hexdigest() == passwords[0])