Arrays in Python give you a huge amount of flexibility for storing, organizing, and accessing data. This is crucial, not least because of Python’s popularity for use in data science.

Python uses zero-based array indexing. In most languages, Python and C included, the first element of an array is accessed with a zero—e.g., string[0] in Python for the first character in a string.

“Python is the closest language to what I call ‘an instant gratification language,’ meaning with very little code, it can accomplish so much, even if you are a novice programmer,” said ...