Python – Concatenate Dynamic Frequency
Given List of elements, perform concatenation with frequency dynamically, i.e each element concatenated with its frequency till its index.
Input : test_list = [‘z’, ‘z’, ‘e’, ‘f’, ‘f’]
Output : [‘1z’, ‘2z’, ‘1e’, ‘1f’, ‘2f’]
Explanation : As occurrence increase, concat number is increased.Input : test_list = [‘g’, ‘f’, ‘g’]
Output : [‘1g’, ‘1f’, ‘2g’]
Explanation : As occurrence increase, concat number is increased.
Method : Using defaultdict() + “+” operator + str()
In this, the dynamic frequency computation is done using defaultdict() and str() is used to convert elements to string for valid concatenation using “+” operator.
Python3
# Python3 code to demonstrate working of # Concatenate Dynamic Frequency# Using defaultdict() + "+" operator + str()from collections import defaultdict # initializing listtest_list = ['z', 'z', 'e', 'f', 'f', 'e', 'f', 'z', 'c'] # printing original listprint("The original list is : " + str(test_list)) memo = defaultdict(int)res = []for ele in test_list: memo[ele] += 1 # adding Frequency with element res.append(str(memo[ele]) + str(ele)) # printing result print("Dynamic Frequency list : " + str(res)) |
The original list is : ['z', 'z', 'e', 'f', 'f', 'e', 'f', 'z', 'c'] Dynamic Frequency list : ['1z', '2z', '1e', '1f', '2f', '2e', '3f', '3z', '1c']
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