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Python | List Element Count with Order
  • Last Updated : 26 Nov, 2019

Sometimes, while working with lists or numbers we can have a problem in which we need to attach with each element of list, a number, which is the position of that element’s occurrence in that list. This type of problem can come across many domains. Let’s discuss a way in which this problem can be solved.

Method : Using defaultdict() + loop
We can perform this task using defaultdict() and loop by carefully assigning and incrementing order of elements.




# Python3 code to demonstrate working of
# List Element Count Order
# using defaultdict() + loop
from collections import defaultdict
  
# initialize list 
test_list = [1, 4, 1, 5, 4, 1, 5]
  
# printing original list 
print("The original list : " + str(test_list))
  
# List Element Count Order
# using defaultdict() + loop
temp = defaultdict(int)
res = []
for ele in test_list:
    temp[ele] += 1
    res.append((ele, temp[ele]))
  
# printing result
print("List elements with their order count : " + str(res))


Output :

The original list : [1, 4, 1, 5, 4, 1, 5]
List elements with their order count : [(1, 1), (4, 1), (1, 2), (5, 1), (4, 2), (1, 3), (5, 2)]

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