Encrypt String With Shift | Dataford Interview Questions

Hitachi Vantara tools may need lightweight text transformations for demonstrations or test fixtures. Implement a Caesar-shift function that encrypts an ASCII string by moving each alphabetic character forward by a given integer shift.

Requirements

Shift lowercase letters within a through z and uppercase letters within A through Z.
Wrap around when a shift passes z or Z.
Support positive, zero, and negative shift values. A negative shift moves characters backward.
Preserve the case of every letter.
Leave digits, whitespace, punctuation, and other non-ASCII characters unchanged.

Formal Specification

Input: text, a string, and shift, an integer.
Output: A new string containing the transformed characters.
The function must not modify the original string.
This is a reversible Caesar transformation, not production-grade encryption.

Constraints

0 <= len(text) <= 10^5
-10^9 <= shift <= 10^9
Only ASCII letters are shifted
Digits, whitespace, punctuation, and other Unicode characters remain unchanged

Function Signature

def encrypt_string(text, shift):

Your question is Encrypt String With Shift. 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.

Problem