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Python: Merge more than one dictionary in a single expression

Python Collections: Exercise-18 with Solution

Write a Python program to merge more than one dictionary in a single expression.

Sample Solution:

Python Code:

import collections as ct
def merge_dictionaries(color1,color2):
    merged_dict = dict(ct.ChainMap({}, color1, color2))
    return merged_dict
color1 = { "R": "Red", "B": "Black", "P": "Pink" }
color2 = { "G": "Green", "W": "White" }
print("Original dictionaries:")
print(color1,' ',color2)
print("\nMerged dictionary:")
print(merge_dictionaries(color1, color2))

def merge_dictionaries(color1,color2, color3):
    merged_dict = dict(ct.ChainMap({}, color1, color2, color3))
    return merged_dict

color1 = { "R": "Red", "B": "Black", "P": "Pink" }
color2 = { "G": "Green", "W": "White" }
color3 = { "O": "Orange", "W": "White", "B": "Black" }

print("\nOriginal dictionaries:")
print(color1,' ',color2, color3)
print("\nMerged dictionary:")
# Duplicate colours have automatically removed.
print(merge_dictionaries(color1, color2, color3))

Sample Output:

Original dictionaries:
{'R': 'Red', 'B': 'Black', 'P': 'Pink'}   {'G': 'Green', 'W': 'White'}

Merged dictionary:
{'B': 'Black', 'R': 'Red', 'P': 'Pink', 'G': 'Green', 'W': 'White'}

Original dictionaries:
{'R': 'Red', 'B': 'Black', 'P': 'Pink'}   {'G': 'Green', 'W': 'White'} {'O': 'Orange', 'W': 'White', 'B': 'Black'}

Merged dictionary:
{'B': 'Black', 'R': 'Red', 'P': 'Pink', 'G': 'Green', 'W': 'White', 'O': 'Orange'}

Flowchart:

Python Collections: Merge more than one dictionary in a single expression.

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Python Code Editor:

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Python: Tips of the Day

Use Reversed() In for Loops:

>>> tasks = ['laundry', 'picking up kids', 'gardening', 'cooking']
>>> for task in reversed(tasks):
...     print(task)
... 
cooking
gardening
picking up kids
laundry