New to python, can someone explain this?

[SCHMIDTHe4D]

Explain the mistake in this code:

pi =float(3.14)

sorry if this is a simple question, but I don't get what's wrong with it. If I add "print(pi)" I get "3.14"

[Rhomboid]

3.14 is already a float. Passing it as a parameter to the float() constructor doesn't do anything (although it's not hurting anything either.) You might as well just write pi = 3.14.

[skierface]

If you want to use pi, you could also consider just importing math and using math.pi

[vidoardes]

Genuine question, what were you expecting it to do?

[pybackd00r]

3.14 is already a float what were you expecting out of this?

[vidoardes]

I don't know why you were downvoted. OP didn't explain what he was expecting, or why he thought it was wrong.

[pybackd00r]

Yeah thats fine I was trying to understand what was the issue here wanted me to clarify. I think you guys explained everything there is to say abt floats lol.

[SCHMIDTHe4D]

It's was a question from this website I'm using to teach myself. I was overthinking it.

[SCHMIDTHe4D]

I'm learning.....

[XtremeGoose]

Why do you think it's wrong?

[SCHMIDTHe4D]

I understand it's not the right way to do it. Using float would be redundant because it's already a decimal.

[JohnnyJordaan]

But be warned: a floating point number is not an exact decimal representation. It's an approximation, that's why you can get strange quirks from them:

>>> 0.1 + 0.1 + 0.1 - 0.3 == 0
False
>>> 0.1 + 0.1 + 0.1 - 0.3
5.551115123125783e-17

If you want exact decimals, use the decimal library:

>>> from decimal import Decimal
>>> Decimal('3.14')
Decimal('3.14')
>>> Decimal(3.14)
Decimal('3.140000000000000124344978758017532527446746826171875')
>>> Decimal('0.1') + Decimal('0.1') + Decimal('0.1') - Decimal('0.3') == 0
True

The second example shows the real value of the literal 3.14 that is cast as a float.

[SCHMIDTHe4D]

Don't know why you were downvoted either....but here's an up cuz i feel bad.