How to express natural numbers in Python

There are two mathematical constants in Python, one is e and the other is PI.

e: Mathematical constant, e is the natural constant (natural constant).

PI: Mathematical constant (pi, generally represented by π).

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The so-called constant is a variable that cannot be changed. For example, the commonly used mathematical constant π is a constant. In Python, constants are usually expressed in all uppercase variable names:

PI=3.14159265359

But in fact PI is still a variable, and Python has no mechanism to guarantee that PI will not be changed. Therefore, it is just a convention to use all uppercase variable names to represent constants. If you must change the value of the variable PI, no one can stop you.

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