Map Cordinates Python
A road map defines locations as map references like B3, where B is the x-coordinate value and 3 is the y-coordinate.
The grid lines are 0.5 km apart.
I'm writing a program that allows the user to enter a trip as a sequence of any number of map references on one line, and reports the total length of the trip, assuming they can travel in straight lines.
Like in the below picture:
Can please somebody instruct me how to do this?