Python Programming Help

Given two dictionaries dic1 and dic2 which may contain some common keys, find the matching of keys in given dictionaries.

This way to find their intersection is very slow:

dic1 = {1: 4.5, 2: 3.0, 3: 1.5}
dic2 = {1: 3.5, 3: 4.5, 4: 1.0, 5: 2.5}

dict1Set = set(dic1)
dict2Set = set(dic2)

for id in dict1Set.intersection(dict2Set):
    print(id)

1

3

And here’s a good way that is simple and fast:

intersect = []
dic1 = {1: 4.5, 2: 3.0, 3: 1.5}
dic2 = {1: 3.5, 3: 4.5, 4: 1.0, 5: 2.5} 

for item in dic1.keys(  ):
    if dic2.has_key(item):
        intersect.append(item)
pr("Intersects:", intersect)