Why is using 'id' as a variable name discouraged in Python?

One should refrain from naming variables id in Python. This is because id() is an integral built-in function that provides a unique identifier for objects within the system's memory.

help(id)

# Output
Help on built-in function id in module __builtin__:

id(...)
    id(object) -> integer

    Return the identity of an object.  This is guaranteed to be unique among
    simultaneously existing objects.  (Hint: it's the object's memory
    address.)

Naming a variable id can lead to naming conflicts with the built-in function. Hence, it is generally advisable to avoid using keywords or built-in function names as variable names.