Given a dictionary where keys are characters and their constituent values are numbers, the task here is to write a python program that can convert it to a list by repeating the key character value times.

Input : test_dict = {‘g’ : 2, ‘f’ : 3, ‘g’ : 1, ‘b’ : 4, ‘e’ : 1, ‘s’ : 4, ‘t’ : 3}

Output : [‘g’, ‘f’, ‘f’, ‘f’, ‘b’, ‘b’, ‘b’, ‘b’, ‘e’, ‘s’, ‘s’, ‘s’, ‘s’, ‘t’, ‘t’, ‘t’]

Explanation : f is added 3 times in list.

Input : test_dict = {‘g’ : 2, ‘f’ : 3, ‘g’ : 1, ‘b’ : 4, ‘e’ : 1}

Output : [‘g’, ‘f’, ‘f’, ‘f’, ‘b’, ‘b’, ‘b’, ‘b’, ‘e’]

Explanation : f is added 3 times in list.

Method 1 : Using loop and * operator

In this, elements are inserted using loop and occurrences are taken care using * operator.

Program:

Output:

The original dictionary is : {‘g’: 1, ‘f’: 3, ‘b’: 4, ‘e’: 1, ‘s’: 4, ‘t’: 3}

The constructed list : [‘g’, ‘f’, ‘f’, ‘f’, ‘b’, ‘b’, ‘b’, ‘b’, ‘e’, ‘s’, ‘s’, ‘s’, ‘s’, ‘t’, ‘t’, ‘t’]

Method 2 : Using list comprehension

This uses nested loop approach using list comprehension as one liner to solve this problem. Iterate the values as much as occurrence required.

Program:

Output:

The original dictionary is : {‘g’: 1, ‘f’: 3, ‘b’: 4, ‘e’: 1, ‘s’: 4, ‘t’: 3}

The constructed list : [‘g’, ‘f’, ‘f’, ‘f’, ‘b’, ‘b’, ‘b’, ‘b’, ‘e’, ‘s’, ‘s’, ‘s’, ‘s’, ‘t’, ‘t’, ‘t’]

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course