discord py antispam

1@client.event #don't forget to add import import asyncio also 
2async def on_ready():
3  print("ready")
4  while True:
5      print("cleared")
6      await asyncio.sleep(10)
7      with open("spam_detect.txt", "r+") as file:
8           file.truncate(0)
9
10@client.event 
11async def on_message(message):
12  counter = 0
13  with open("spam_detect.txt", "r+") as file:
14      for lines in file:
15          if lines.strip("\n") == str(message.author.id):
16              counter+=1
17
18      file.writelines(f"{str(message.author.id)}\n")#bans the user spamming
19      if counter > 5:
20        await message.guild.ban(message.author, reson="spam")
21        await asyncio.sleep(1)
22        await message.guild.unban(message.author)
23        print("uh oh")