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Update Section 2: The Basics: Getting Started with Python.md

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Modifying loop iterator in Python

Batch image resizing through loop

Loading, Displaying, Resizing, and Creating Images

Complete section 14

Convert Images to Numpy Arrays

Add cheatsheet for processing user input

String Formatting with Multiple Variables

String formatting

Converting Between Datatypes

Accessing Characters and Slices in Strings

Accessing Items and Slices with Negative Indexes

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