Reference no: EM132174817

USING PYTHON: In this problem, you want to write a function revdict that takes a dictionary D and returns a dictionary R that reverses D by mak- ing the keys into values and the values into keys. For example if D[k] = v we would want R[v] = k.

There's a problem. The keys in a dictionary are unique while several keys may have the same value. To fix this, we'll let R[v] be a list of the keys that have value v. So, if

D = { 'A':1, 'B':2, 'C':1}

we'll have R[2] = ['B'] and R[1] = ['A', 'C'].

Write the function revdict. Include sorce code for the function and and some test runs to show it works.