[Python] Password Checker

I have created a password checker which generates a random character and compares it until all the characters are the same. But as it rolls through it repeats the character multiple times. Is there a way of making it so the character doesn't repeat, possibly putting the characters into a list? I could then use the

list.del()


function to stop it repeating. Here is my code:

import string
import random
import time
print('Welcome to the password checker')
characters = string.ascii_lowercase + string.digits + string.ascii_uppercase + ' .,!?;:`"+/*()@#$&_-='

password = input("Enter your password: ")
tryFirst = ''.join(random.choice(characters) for i in range(len(password)))
trySecond = ''

Finished = False

attempt = 0
while Finished == False:
print("{}) {}".format(attempt,tryFirst))
trySecond = ''
Finished = True
for num in range(len(password)):
if tryFirst[num] != password[num]:
Finished = False
trySecond += random.choice(characters)
else:
trySecond += password[num]
attempt += 1
tryFirst = trySecond
time.sleep(0.05)
print("Password found! That took {} attempts".format(attempt))
if attempt < 100:
print("Your password isn't safe")
elif attempt < 250:
print("Your password is quite safe, could do with improvement")
elif attempt < 400:
print("Your password is adequately safe")
elif attempt < 600:
print("Your pasword is safe")

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