Greeting Formatter Class

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

Domain

Python

Difficulty

easy

Seniority

L3

Problem

Implement a class `MessageFormatter(text)` with a method `sort_by_case()` that returns `text` rearranged so all lowercase letters come first (in their original relative order), followed by all uppercase letters (in their original relative order), followed by all non-letter characters (digits, spaces, punctuation) in their original relative order. For example, `MessageFormatter('hElLo').sort_by_case()` returns `'hloEL'`. Then implement a top-level driver function `sort_by_case(text)` that constructs `MessageFormatter(text)`, calls its method, and returns the resulting string. The driver is the entry point that is graded: given a single string argument it returns the reordered string.

Summary

First impressions are formatted carefully.

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