RandomPasswordGenerator.py

# Random password generator
import random, re, string

def validate(password):
  # password validation
  # a letter
  letter = re.search(r"[a-zA-Z]",
    password) is None
  # a digit
  digit = re.search(r"\d", password) is None
  # a symbol
  symbol = re.search(r"\W", password) is None

  return not(letter or digit or symbol)


def random_password(length):
  charset = (
    string.ascii_letters
    + string.digits
    + string.punctuation
  )
  return ''.join((
    random.choice(charset)
      for ch in range(length)
  ))


def main():
  try:
    # Enter the length of password to be generated
    passwd_len = int(input())
  except:
    print("Please enter a number!")
    return 1
        
  if passwd_len >= 3 and passwd_len <= 100:
    password = ""
    while not validate(password):
        password = random_password(
          passwd_len
        )
    print("Your new password is ready :")
    print("-"*30)
    print(password)
        
  else:
    print("Please enter a number between 3 and 100.")


if __name__ == "__main__":
    main()