Pandas

Question 1

DataFrame vs. Series

Answer 1

A Series is a one-dimensional array of values with an index.

A DataFrame is a two-dimensional array of values with both a row and column index.

Question 2

Pandas Indexing: .loc and .iloc

Answer 2

Pandas has two properties that you can use for indexing:
.loc indexes with the labels for rows and columns axis.
.iloc indexes with the integer positions for rows and columns axis.