TypeError: 'NoneType' object is not subscriptable matrix code example

Example 1: TypeError: 'NoneType' object is not subscriptable

This error occurs when you try to use the integer type value as an array. In simple terms, this error occurs when your program has a variable that is treated as an array by your function, but actually, that variable is an integer.

Example 2: TypeError: 'NoneType' object is not subscriptable

Happens if you append a "None" Value to a list/ array / dictionary