Python: Merge more than one dictionary in a single expression

Last update on December 21 2024 07:25:15 (UTC/GMT +8 hours)

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

Sample Solution:

Python Code:

# Import the collections module and alias it as 'ct'
import collections as ct

# Define a function 'merge_dictionaries' that takes two dictionaries as input and merges them using ChainMap
def merge_dictionaries(color1, color2):
    # Create a merged dictionary using ChainMap by chaining the provided dictionaries
    merged_dict = dict(ct.ChainMap({}, color1, color2))
    return merged_dict

# Create two dictionaries 'color1' and 'color2'
color1 = { "R": "Red", "B": "Black", "P": "Pink" }
color2 = { "G": "Green", "W": "White" }

# Print a message to indicate the display of the original dictionaries
print("Original dictionaries:")

# Print the content of 'color1' and 'color2'
print(color1, ' ', color2)

# Print a message to indicate the display of the merged dictionary
print("\nMerged dictionary:")

# Call the 'merge_dictionaries' function with 'color1' and 'color2' and print the result
print(merge_dictionaries(color1, color2))

# Define a function 'merge_dictionaries' that takes three dictionaries as input and merges them using ChainMap
def merge_dictionaries(color1, color2, color3):
    # Create a merged dictionary using ChainMap by chaining the provided dictionaries
    merged_dict = dict(ct.ChainMap({}, color1, color2, color3))
    return merged_dict

# Create three dictionaries 'color1', 'color2', and 'color3'
color1 = { "R": "Red", "B": "Black", "P": "Pink" }
color2 = { "G": "Green", "W": "White" }
color3 = { "O": "Orange", "W": "White", "B": "Black" }

# Print a message to indicate the display of the original dictionaries
print("\nOriginal dictionaries:")

# Print the content of 'color1', 'color2', and 'color3'
print(color1, ' ', color2, color3)

# Print a message to indicate the display of the merged dictionary
print("\nMerged dictionary:")

# Call the 'merge_dictionaries' function with 'color1', 'color2', and 'color3' and print the result
# Duplicate colors have been automatically removed due to ChainMap
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 Code Editor:

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