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Python dictionary with keys having multiple inputs
  • Difficulty Level : Basic
  • Last Updated : 26 Nov, 2018

Prerequisite : Python-Dictionary.

How to create a dictionary where a key is formed using inputs?

Let us consider an example where have an equation for three input variables, x, y and z. We want to store values of equation for different input triplets.

Example 1:




# Python code to demonstrate a dictionary
# with multiple inputs in a key.
import random as rn
  
# creating an empty dictionary
dict = {}
  
# Insert first triplet in dictionary
x, y, z = 10, 20, 30
dict[x, y, z] = x + y - z;
  
# Insert second triplet in dictionary
x, y, z = 5, 2, 4
dict[x, y, z] = x + y - z;
  
# print the dictionary
print(dict)


Example 2: Let’s get access to the keys.
Let us consider a dictionary where longitude and latitude are the keys and the place to which they belong to is the value.




# dictionary containing longitude and latitude of places
places = {("19.07'53.2", "72.54'51.0"):"Mumbai", \
          ("28.33'34.1", "77.06'16.6"):"Delhi"}
  
print(places)
print('\n')
  
# Traversing dictionary with multi-keys and crearing
# different lists from it
lat = []
long = []
plc = []
for i in places:
    lat.append(i[0])
    long.append(i[1])
    plc.append(places[i[0], i[1]])
  
print(lat)
print(long)
print(plc)


Now that the keys(latitude, longitude) and values(place) are stored in a list, we can access it easily.

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