Subsetting 2D arrays

Subsetting 2D arrays is similar to subsetting nested lists. In a 2D array, the indexing or slicing must be specific to the dimension of the array:

array[row_index, column_index]

numpy is imported as np and the 2D array stock_array_transposed (from the previous exercise) is available in your workspace.

Extract the first column from stock_array_transposed and assign it to prices.