Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Python – Cross mapping of Two dictionary value lists
When it is required to cross-map two dictionary valued lists, the ‘setdefault’ and ‘extend’ methods are used.
Example
Below is a demonstration of the same −
my_dict_1 = {"Python" : [4, 7], "Fun" : [8, 6]}
my_dict_2 = {6 : [5, 7], 8 : [3, 6], 7 : [9, 8]}
print("The first dictionary is : " )
print(my_dict_1)
print("The second dictionary is : " )
print(my_dict_2)
sorted(my_dict_1.items(), key=lambda e: e[1][1])
print("The first dictionary after sorting is ")
print(my_dict_1)
sorted(my_dict_2.items(), key=lambda e: e[1][1])
print("The second dictionary after sorting is ")
print(my_dict_2)
my_result = {}
for key, value in my_dict_1.items():
for index in value:
my_result.setdefault(key, []).extend(my_dict_2.get(index, []))
print("The resultant dictionary is : ")
print(my_result)Output
The first dictionary is :
{'Python': [4, 7], 'Fun': [8, 6]}
The second dictionary is :
{6: [5, 7], 8: [3, 6], 7: [9, 8]}
The first dictionary after sorting is
{'Python': [4, 7], 'Fun': [8, 6]}
The second dictionary after sorting is
{6: [5, 7], 8: [3, 6], 7: [9, 8]}
The resultant dictionary is :
{'Python': [9, 8], 'Fun': [3, 6, 5, 7]}Explanation
Two dictionaries are defined and is displayed on the console.
They are sorted using ‘sorted’ method and lambda method and displayed on the console.
An empty dictionary is created.
The dictionary is iterated over, and the key is set to a default value.
The index of the elements in the second dictionary is obtained and added to empty dictionary using the ‘extend’ method.
This is the output that is displayed on the console.
Updated on: 13-Sep-2021
460 Views
Advertisements