how to make a discord moderation bot python

1import discord
2
3class MyClient(discord.Client):
4
5    async def on_ready(self):
6        print('Logged on as', self.user)
7
8    async def on_message(self, message):
9        word_list = ['cheat', 'cheats', 'hack', 'hacks', 'internal', 'external', 'ddos', 'denial of service']
10
11        # don't respond to ourselves
12        if message.author == self.user:
13            return
14
15        messageContent = message.content
16        if len(messageContent) > 0:
17            for word in word_list:
18                if word in messageContent:
19                    await message.delete()
20                    await message.channel.send('Do not say that!')
21            
22        messageattachments = message.attachments
23        if len(messageattachments) > 0:
24            for attachment in messageattachments:
25                if attachment.filename.endswith(".dll"):
26                    await message.delete()
27                    await message.channel.send("No DLL's allowed!")
28                elif attachment.filename.endswith('.exe'):
29                    await message.delete()
30                    await message.channel.send("No EXE's allowed!")
31                else:
32                    break
33
34client = MyClient()
35client.run('token here')

1how do i make it so it takes capitals like FUCK it wont delete but if i add that to word list things like fUck wont delete cus capital U