在相同的键和值上合并两个 python 字典

Question

For example I have two dictionaries d1 and d2

d1 = {'a': ['b','c'], 'd': ['e', 'f']}
d2 = {'b':[1, 2], 'c': [3, 4], 'd': [5, 6], 'e': [7, 8], 'f': [9, 10]}

I expect a new dictionary d3 that looks like

d3 = {'a':{'b':[1, 2], 'c': [3, 4]}, 'd': {'e': [7, 8], 'f': [9, 10]}}

I have tried all kinds of looping but it does not work.

Answer 1

You can use dict comprehension -

d1 = {'a': ['b','c'], 'd': ['e', 'f']}
d2 = {'b':[1, 2], 'c': [3, 4], 'd': [5, 6], 'e': [7, 8], 'f': [9, 10]}
d3 = {k1:{v:d2[v] for v in v1} for k1, v1 in d1.items()}
print(d3)

Output:

{'a': {'b': [1, 2], 'c': [3, 4]}, 'd': {'e': [7, 8], 'f': [9, 10]}}

Here, for every key( k1 ) in d1 , we are creating an entry in d3 and the corresponding value is another dict, where key is values from first dict and corresponding value in d2 for the key.