Sorting algorithms in Python - Insertion Sort

Once again - sorting algorithms in Python. Today is the day of the Insertion sort. It still O(n^2) algorithm, but its a step towards better somewhat O(n^1.5-1.2) which is called Shell sort (in next vid i believe). Maybe I`ll make a video where I`ll show my steps sequence that is better than Knuth`s sequence for like twice, idk.
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