Instance vs Local Variables | Dataford Interview Questions

What are instance variables and local variables, and where are they stored in memory?

Given a class definition and a sequence of operations, classify each referenced variable as instance or local, and identify whether it is stored with the object instance or on the call stack for the current function call.

Function Signature

classify_variables(operations)

operations is a list of dictionaries describing assignments and reads inside a class method. Return a list of strings in the same order, where each string is one of: "instance:object", "local:stack", or "unknown".

Constraints

1 <= len(operations) <= 1000
Each operation has keys scope, name, kind, and target
scope is always "method"
kind is one of "assign" or "read"
target is one of "self" or "local"

Function Signature

def classify_variables(operations):

Your question is Instance vs Local Variables. Start with the requirements in the Question tab.

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Problem

What are instance variables and local variables, and where are they stored in memory?

Function Signature

classify_variables(operations)

Constraints

1 <= len(operations) <= 1000
Each operation has keys scope, name, kind, and target
scope is always "method"
kind is one of "assign" or "read"
target is one of "self" or "local"

Function Signature

def classify_variables(operations):

Your question is Instance vs Local Variables. Start with the requirements in the Question tab.

Run and submit as often as you like. When you're ready, talk me through your approach or go straight to the code.