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You may have noticed that when doing arithmetic with floats in Python you sometimes get strange results, like this:

>>> 0.1 + 0.2
0.30000000000000004

Why this happens Internally your computer stores floats as binary fractions. Many decimal values cannot be stored as exact binary fractions, which means an approximation has to be used.

How you can avoid this You can use math.isclose to check if two floats are close, or to get an exact decimal representation, you can use the decimal or fractions module. Here are some examples:

>>> math.isclose(0.1 + 0.2, 0.3)
True
>>> decimal.Decimal('0.1') + decimal.Decimal('0.2')
Decimal('0.3')

Note that with decimal.Decimal we enter the number we want as a string so we don't pass on the imprecision from the float.

For more details on why this happens check out this page in the python docs or this Computerphile video.

The Discord gateway only dispatches events you subscribe to, which you can configure by using "intents."

The message content intent is what determines if an app will receive the actual content of newly created messages. Without this intent, discord.py won't be able to detect prefix commands, so prefix commands won't respond.

Privileged intents, such as message content, have to be explicitly enabled from the Discord Developer Portal in addition to being enabled in the code:

intents = discord.Intents.default() # create a default Intents instance
intents.message_content = True # enable message content intents

bot = commands.Bot(command_prefix="!", intents=intents) # actually pass it into the constructor

For more information on intents, see /tag intents. If prefix commands are still not working, see /tag on-message-event.