The Timing Decorator

A medium Python interview practice problem on DataDriven. Write and execute real python code with instant grading.

Domain

Python

Difficulty

medium

Seniority

L4

Problem

Implement `apply_timer_decorator(func_calls)`. Inside it, define a `@timer` decorator that wraps any function: it records `time.time()` before and after the call, prints the elapsed time, and returns whatever the wrapped function returns. The decorator must forward arbitrary `*args` and `**kwargs`. `func_calls` is a list of `[name, args, kwargs]` triples, where `name` selects a built-in callable ("add", "sub", "mul", "concat", "noop"), `args` is a list of positional arguments, and `kwargs` is a dict of keyword arguments. For each triple, apply your timer decorator to the named callable and invoke it with the given arguments. Return a list of `True` (one per successful call), in input order. An empty `func_calls` returns an empty list.

Summary

Wrap any function to capture how long it takes.

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