How to multiply individual elements of a list with a number?

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In NumPy it is quite simple

import numpy as np
P=2.45
S=[22, 33, 45.6, 21.6, 51.8]
SP = P*np.array(S)

I recommend taking a look at the NumPy tutorial for an explanation of the full capabilities of NumPy’s arrays:

https://scipy.github.io/old-wiki/pages/Tentative_NumPy_Tutorial

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