Sometimes, while working with Python list, we can have a problem in which we need to extend a list in a very customized way. We may have to repeat contents of list and while doing that, each time new list must add a number to original list. This incremental expansion has applications in many domains. Let’s discuss a way in which this task can be performed.
Method : Using list comprehension
This task can be performed in a brute manner, but having a shorter implementation using list comprehension always is better. In this, we perform task in 2 steps, first we make a helper list to form a addition factor list and then cumulate the result using original list.
# Python3 code to demonstrate working of# Incremental List Extension# Using list comprehension # initializing listtest_list = [7, 8, 9] # printing original listprint("The original list is : " + str(test_list)) # Extension factorN = 4 # Addition factor M = 3 # Incremental List Extension# Using list comprehensiontemp = [1 * M**i for i in range(N)]temp[0] = 0res = list([ele + tele for tele in temp for ele in test_list]) # printing result print("List after extension and addition : " + str(res)) |
The original list is : [7, 8, 9] List after extension and addition : [7, 8, 9, 10, 11, 12, 16, 17, 18, 34, 35, 36]
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