Python – Extract Rear K digits from Numbers
Given an Integer list, extract rear K digits from it.
Input : test_list = [5645, 23567, 34543, 87652, 2342], K = 2
Output : [45, 67, 43, 52, 42]
Explanation : Last 2 digits extracted.Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
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Input : test_list = [5645, 23567, 34543, 87652, 2342], K = 4
Output : [5645, 3567, 4543, 7652, 2342]
Explanation : Last 4 digits extracted.
Method #1 : Using list comprehension + % operator
In this technique, we modulo each number with 10^K to get the desired last K digits of each number.
Python3
# Python3 code to demonstrate working of # Extract Rear K digits from Numbers# Using list comprehension + % operator # initializing listtest_list = [5645, 23567, 34543, 87652, 2342] # printing original listprint("The original list is : " + str(test_list)) # initializing K K = 3 # Getting remainder for each elementres = [ele % (10 ** K) for ele in test_list] # printing result print("Rear K digits of elements ? : " + str(res)) |
The original list is : [5645, 23567, 34543, 87652, 2342] Rear K digits of elements ? : [645, 567, 543, 652, 342]
Method #2 : Using str() + slicing
In this, we perform task of getting rear elements using list slicing, and str() is used to convert each element to string.
Python3
# Python3 code to demonstrate working of # Extract Rear K digits from Numbers# Using str() + slicing # initializing listtest_list = [5645, 23567, 34543, 87652, 2342] # printing original listprint("The original list is : " + str(test_list)) # initializing K K = 3 # getting integer using int() after slicing stringres = [int(str(idx)[-K:]) for idx in test_list] # printing result print("Rear K digits of elements ? : " + str(res)) |
The original list is : [5645, 23567, 34543, 87652, 2342] Rear K digits of elements ? : [645, 567, 543, 652, 342]
