The Stream Averager

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

Domain

Python

Difficulty

easy

Seniority

L5

Problem

Implement StreamAverager with add(key, value) and get_averages(). add records a reading; get_averages returns a dict mapping each key to the average of its values. Test harness: ['add', key, value] and ['get_averages']; returns parallel list (None for add, dict for get_averages).

Summary

The answer moves with the data.

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