PYTHON PLZZ The distance between two points in a grid is based on a strictly horizontal and/or vertical path (that is, along the grid lines), as opposed to the diagonal or "as the crow flies" distance. The Manhattan distance is the simple sum of the horizontal and vertical components, whereas the diagonal distance might be computed by applying the Pythagorean theorem.

For example, in the cartesian plane, the Manhattan distance between and is

For more information see: https://en.wikipedia.org/wiki/Taxicab_geometry#Formal_definition

Use the Design Recipe to write a function called calculate_manhattan_distance which consumes 4 parameters representing p1, p2, q1, and q2 (in that order) and produces the manhattan distance between (p1,p2) and (q1,q2). Include a Docstring.

Write three assertEqual statements to test your function.