Question about math.pi is mutable

[Ben Finney]

Bartc <bc at freeuk.com> writes:

> Is there no way then in Python to declare:
>
>    pi = 3.141519     # etc
>
> and make it impossible to override?

No, and it would be a bad thing if that were something a library author
could forbid.

Python assumes the programmers using it are consenting adults. Doing
harmful things is difficult but not forbidden.

Notably, the author of a library should not be forbidding the Pythonic
ability to change name bindings as needed.

If you want to have a different value bound to the name ‘math.pi’, and
you go ahead and explicitly ask to change that binding, the library
author has no business forbidding that.

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Ben Finney