python暴力解読MD 5

from hashlib import md5
from string import ascii_letters,digits
from itertools import permutations
from time import time
all_letters=ascii_letters+digits+'.,;'
def decrypt_md5(md5_value):
    if len(md5_value)!=32:
        print('error')
        return
    md5_value=md5_value.lower()
    for k in range(5,10):
        for item in permutations(all_letters,k):
            item=''.join(item)
            print('.',end='')
            if md5(item.encode()).hexdigest()==md5_value:
                return item
md5_value  ='e7d057704ea5206d8cb61280741238f5'
start=time()
result=decrypt_md5(md5_value)
if result:
    print('
 Success: '+md5_value+'==>'+result)
print('Time used:',time()-start)