How to encrypt and write a string to a file using Python?

Question

Encryption

Hello.
There is a code that, after the end of the game, should read a line from the file (record), compare it with the result of the player and write it to the file in encrypted form.
The code looks like this:

def write_record(self):
    try:
      self.record_file = open("../statistics/record.txt", "r")
    except:
      sys.exit()

    for line in self.record_file:
      print(line)
      self.record = self.decryptor.decrypt(line.decode("hex"))
      print(self.record)
      self.record = self.record[0:len(self.record) / 16]
      print(self.record)
    
    if int(self.record) < self.fugitive.time_score:
      self.record = self.fugitive.time_score

    self.record_file.close()

    try:
      self.record_file = open("../statistics/record.txt", "w")
    except:
      sys.exit()

    self.record = self.encryptor.encrypt(str(self.record) * 16)
    self.record_file.write(self.record.encode("hex"))

    self.record_file.close()

On first run output:
8eebc122fe1508e1eb4c6f2f9c8b0021
6666666666666666
6
On restart of game output:
8eebc122fe1508e1eb4c6f2f9c8b0021
#>zY6
Screenshot attached:

Why is this happening? How to fix