Ok so technically Python is call-by-object and how it behaves depends on what you're doing. The 1st case below behaves like pass-by-value as expected.

Python Variables Variables in Python are like containers that store data values. ... The assignment is the process of changing the value of a variable after it has been declared and initialized.

from string.templatelib import Template, Interpolation string.templatelib is a new module in the standard library for Python 3.14 that holds the types we need: Template for the type hint to the ...