Why is 0.1 * 0.2 arithmetically incorrect?

[Pedroski55]

On the face of it, this seems an easy sum to do:

>>> 0.2 * 0.1
0.020000000000000004

Python is not good at arithmetic?

[bowlofred]

See the python FAQ

(which will also suggest that you check out the floating point tutorial.)

[snippsat]

It's the way floating point arithmetic work, Basic Answers.
https://0.30000000000000004.com/

There is a Decimal module or other method to overcome this if needed.

>>> from decimal import Decimal
>>> 
>>> result = Decimal('0.2') * Decimal('0.1')
>>> result
Decimal('0.02')
>>> print(result)
0.02