Write a Python program that concatenates following dictionaries into a new one dictionary

Python Python Dictionary (Article) Python Dictionary (Program)

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Program:

dictionaryl=  {1:20, 4:40}
dictionary2=  {6:60, 8:80}
dictionary3= {10:100, 12:120}
dictionary4 = {}
for d in (dictionaryl, dictionary2, dictionary3):
    dictionary4.update(d) 
print(dictionary4)

Output:

{1: 20, 4: 40, 6: 60, 8: 80, 10: 100, 12: 120}

Explanation:

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