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 – Restrict Elements Frequency in List
When it is required to restrict elements frequency in a list, a simple iteration is used along with the ‘append’ method.
Example
Below is a demonstration of the same −
from collections import defaultdict
my_list = [11, 14, 15,14, 11, 14, 14, 15, 15, 16]
print("The list is :")
print(my_list)
my_dict = {14 : 3, 11 : 1, 16 : 1, 15 : 2}
print("The dictionary is :")
print(my_dict)
my_result = []
my_def_dict = defaultdict(int)
for element in my_list:
my_def_dict[element] += 1
if my_def_dict[element] > my_dict[element]:
continue
else:
my_result.append(element)
print("The result is :")
print(my_result)Output
The list is :
[11, 14, 15, 14, 11, 14, 14, 15, 15, 16]
The restrict dictionary is :
{14: 3, 11: 1, 16: 1, 15: 2}
The result is :
[11, 14, 15, 14, 14, 15, 16]Explanation
The required packages are imported into the environment.
A list of integers is defined and is displayed on the console.
A dictionary is defined and displayed on the console.
An empty list is defined.
A default dictionary of integers is defined.
The original list is iterated over, and the dictionary elements are incremented by 1.
Depending on whether the element in the original dictionary and default dictionary are greater or not, the ‘continue’ operator is used.
Then, the ‘append’ method is used to add the element to the empty list.
This is the output that is displayed on the console.
233 Views
