Merging Dictionaries in Python

Python provides the ability to merge two dictionaries. However, if we use the + operator, we will get an error.

Let us have the following dictionaries:

dct1 = {
	'a': 1,
	'b': 2,
	'c': 3
}

dct2 = {
	'e': 4,
	'f': 5
}

Let's try to combine them using the operator +:

print(dct1 + dct2) # will display an error

The correct solution would be to use the update method. In its parameter, we specify the dictionary with which we will supplement the original:

dct1.update(dct2)
print(dct1) # {'a': 1, 'b': 2, 'c': 3, 'e': 4, 'f': 5}

Two dictionaries are given:

dct1 = {
	'a': 1,
	'b': 2,
	'c': 3
}

dct2 = {
	'x': 4,
	'y': 5,
	'z': 6
}

Combine the dictionaries into one.

Two dictionaries are given:

dct1 = {
	'3': 'c',
	'4': 'd',
	'5': 'e'
}

dct2 = {
	'1': 'a',
	'2': 'b'
}

Write the code to get the following result:

{'1': 'a', '2': 'b', '3': 'c', '4': 'd', '5': 'e'}

Two dictionaries are given:

dct1 = {
	'a': 1,
	'b': 2,
	'c': 3
}

dct2 = {
	'x': 4,
	'y': 5,
	'z': 6
}

Merge dictionaries into one, then get a list of items in the new dictionary.

Three dictionaries are given:

dct1 = {
	'a': 1,
	'b': 2,
	'c': 3
}

dct2 = {
	'd': 4,
	'e': 5,
	'f': 6
}

dct3 = {
	'j': 7,
	'h': 8,
	'i': 9
}

Combine the dictionaries into one.