Help with Python 3 coding function

Consider two dictionaries d1 and d2 of the same structure: with strings as keys and a list as values. This function creates a combined dictionary of the same structure but with the merged information from both d1 and d2: For a key s that belongs to only one of the original dictionaries in a pair like s: xs, include the same pair in the new dictionary; For a key s that is present in both d1 and d2, like s: xs in d1 and s: ys in d2, include s: zs in the new dictionary where zs is the concatenation of xs and ys. Keep the duplicates in zs. Return value: the newly created dictionary. Do NOT update dl or d2. Examples: d1 = {'cardinal':['Virginia', Ohio'], 'meadowlark':[?regan']} d2 = {'robin': ['Connecticut']} d3 = {'meadowlark':['Wyoming'], 'cardinal1:['Virginia', 'Illinois'], 'oriole1:['Maryland']} merge(dl, d2) rightarrow {'cardinal':['Virginia', Ohio'], 'meadowlark':[?regan'], 'robin': ['Connecticut']} O merge(dl, d3) rightarrow {'cardinal':['Virginia', Ohio', 'Virginia', 'Illinois'], 'meadowlark':[?regan', 'Wyoming'], 'oriole':['Maryland']}