Python: Create a dictionary from two lists without losing duplicate values

Python dictionary: Exercise-36 with Solution

Write a Python program to create a dictionary from two lists without losing duplicate values.

Visual Presentation:

Sample Solution:

Python Code:

# Import the 'defaultdict' class from the 'collections' module.
from collections import defaultdict

# Create a list 'class_list' with class names and a list 'id_list' with corresponding IDs.
class_list = ['Class-V', 'Class-VI', 'Class-VII', 'Class-VIII']
id_list = [1, 2, 2, 3]

# Create a defaultdict 'temp' with set as the default factory function.
temp = defaultdict(set)

# Iterate through paired elements of 'class_list' and 'id_list' using the 'zip' function.
for c, i in zip(class_list, id_list):
    # Add the 'i' value to the set associated with the 'c' key in the 'temp' defaultdict.
    temp[c].add(i)

# Print the 'temp' defaultdict, which groups IDs by class name.
print(temp) 

Sample Output:

defaultdict(<class 'set'>, {'Class-V': {1}, 'Class-VI': {2}, 'Class-VII': {2}, 'Class-VIII': {3}})

Python Code Editor:

Previous: Write a Python program to sort Counter by value.
Next: Write a Python program to replace dictionary values with their sum.