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PUBLISHED ON: AUGUST 11, 2021

# Python dictionary with keys having multiple inputs

In this tutorial, you will learn to create a dictionary with keys having multiple inputs in Python. We have to create a dictionary, in which there will be one key for multiple inputs.

Take a look at the sample input-output of the program.

Input: x= 2 y= 1 z=9 , p=3, p=5, r=2

Output: {'x+y+z' : [12, 10]}

Input: {''words with d" : ['dog', 'dark', 'dance'] , "words with a": ['apple', 'act', 'ace']}

Output:{''words with d" : ['dog', 'dark', 'dance', 'den'] , "words with a": ['apple', 'act', 'ace','all']}

To solve this problem, we will first create an empty dictionary and insert multiple values in it. We will see two examples of when we have to create a dictionary with keys having multiple inputs.

## Example 1: linear equation as key

For this let us consider an example where we have a linear equation of three vari\ables x, y, and z. We have to store the values given by the equation for different values of x,y, and z given as input.

### Algorithm

Follow the algorithm to understand the approach better.

Step 1- Define an empty dictionary

Step 2- Insert values of x, y and z

Step 3- In the dictionary store x,y and z as keys and the value given by the equation will be stored as the value

Step 4- Give multiple values for the x, y and z keys

Step 5- Print the dictionary

### Python Program 1

Look at the Python code to understand the implementation. We have created a dictionary that will have the value of x,y and z as keys and the value given by the equation will be the value in the dictionary.

``````# creating an empty dictionary
dic = {}
# Inserting first inputs in dictionary
a,b,c= 5, 3, 10
# Insert second inputs in dictionary
p,q,r= 12, 6, 9
dic["x-y+z"] = [a-b+c,p-q+r]
# print the dictionary
print(dic)``````

{'x-y+z': [12, 15]}

## Example 2: States as keys

In this example, we will have to create a dictionary where the state name is the key and the different cities in the state are its values.

### Algorithm

Follow the algorithm to understand the approach better.

Step 1- Define a function to add values in the key

Step 2- In the function check if the key is not in the dictionary we will create a new key in the dictionary

Step 3- Else add the value in the key

Step 4- Return the dictionary after adding values

Step 5- Create a dictionary with states as keys and cities as values

Step 6- Print original Dictionary

Step 7- Declare another variable to store the value returned by the function

Step 8- Call the defined function to add value in the key

Step 9- Print the value in the variable

### Python Program 2

Look at the Python code to understand the implementation. In this program, we have defined a dictionary for storing the multiple cities of a state.

``````# dictionary with multiple inputs in a key

# function to add multiple values
"""Append multiple values to a key in the given dictionary"""
if key not in dic:
dic[key] = list()
dic[key].extend(list_of_values)
return dic

# dictionary containing states and its cities
places = {("Maharashtra"):["Mumbai","Pune","Nagpur"],

print(places)
print('\n')

``````