How are variables implemented and managed inside the Python interpreter?

In the Python interpreter, variables are implemented as references to objects in memory. When a variable is created, it does not store the value directly but points to an object that contains the data.

Variable management is handled through scopes: local, global, and built-in. When accessing a variable, the interpreter first looks in the local scope, then in the global scope, and finally in the built-in scope.

Variables are stored in dictionaries (dict), for example, local variables are in locals(), global variables are in globals(). This allows dynamic creation, modification, and deletion of variables during runtime.

Example:

x = [1, 2, 3]  # x is a variable pointing to a list
print(id(x))   # id of the object in memory

x.append(4)    # modify the object that x points to
print(x)       # [1, 2, 3, 4]

Thus, variables are names associated with objects, and their management occurs through scopes and dictionaries that store these associations.