Python: Create a key-value list pairings in a given dictionary

Last update on April 21 2025 12:59:41 (UTC/GMT +8 hours)

64. Create Key-Value List Pairings within a Dictionary

Write a Python program that creates key-value list pairings within a dictionary.

Visual Presentation:

Sample Solution:

Python Code:

# Import the 'product' function from the 'itertools' module.
from itertools import product

# Define a function 'test' that takes a dictionary 'dictt' as an argument.
def test(dictt):
    # Use a list comprehension to create a list of dictionaries by pairing keys from 'dictt'
    # with all possible combinations of values from the input dictionary.
    result = [dict(zip(dictt, sub)) for sub in product(*dictt.values())]
    return result

# Create a dictionary 'students' where keys are student IDs and values are lists with one name each.
students = {1: ['Jean Castro'], 2: ['Lula Powell'], 3: ['Brian Howell'], 4: ['Lynne Foster'], 5: ['Zachary Simon']}

# Print a message indicating the start of the code section and display the original dictionary.
print("\nOriginal dictionary:")
print(students)

# Print a message indicating the purpose and demonstrate the 'test' function's usage
# to generate key-value list pairings from the dictionary.
print("\nA key-value list pairings of the said dictionary:")
print(test(students)) 

Sample Output:

Original dictionary:
{1: ['Jean Castro'], 2: ['Lula Powell'], 3: ['Brian Howell'], 4: ['Lynne Foster'], 5: ['Zachary Simon']}

A key-value list pairings of the said dictionary:
[{1: 'Jean Castro', 2: 'Lula Powell', 3: 'Brian Howell', 4: 'Lynne Foster', 5: 'Zachary Simon'}]

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Python program to merge a dictionary of lists into a single dictionary by pairing each key with the first element of its list.
• Write a Python program to convert a dictionary with list values into a list containing one dictionary with key-value pairings.
• Write a Python program to iterate over a dictionary of lists and combine the key with its concatenated list elements into a new dictionary.
• Write a Python program to use list comprehension to create a key-value pairing from a dictionary where each key maps to a joined string of its list.

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