Merge two dictionaries in python

Question

I'm trying to merge two dictionaries based on key value. However, I'm not able to achieve it. Below is the way I tried solving.

dict1 = {4: [741, 114, 306, 70],
         2: [77, 325, 505, 144],
         3: [937, 339, 612, 100],
         1: [52, 811, 1593, 350]}
dict2 = {1: 'A', 2: 'B', 3: 'C', 4: 'D'}

My resultant dictionary should be

output = {'D': [741, 114, 306, 70],
          'B': [77, 325, 505, 144],
          'C': [937, 339, 612, 100],
          'A': [52, 811, 1593, 350]}

My code

def mergeDictionary(dict_obj1, dict_obj2):
    dict_obj3 = {**dict_obj1, **dict_obj2}
    for key, value in dict_obj3.items():
        if key in dict_obj1 and key in dict_obj2:
               dict_obj3[key] = [value , dict_obj1[key]]
    return dict_obj3

dict_3 = mergeDictionary(dict1, dict2)

But I'm getting this as output

dict_3={4: ['D', [741, 114, 306, 70]], 2: ['B', [77, 325, 505, 144]], 3: ['C', [937, 339, 612, 100]], 1: ['A', [52, 811, 1593, 350]]}

Answer 1

Use a simple dictionary comprehension:

output = {dict2[k]: v for k,v in dict1.items()}

Output:

{'D': [741, 114, 306, 70],
 'B': [77, 325, 505, 144],
 'C': [937, 339, 612, 100],
 'A': [52, 811, 1593, 350]}