Python | Find missing elements in List
Sometimes, we can get elements in range as input but some values are missing in otherwise consecutive range. We might have a use case in which we need to get all the missing elements. Let’s discuss certain ways in which this can be done.
Method #1 : Using list comprehension
We can perform the task of finding missing elements using the range function to get the maximum element fill and then insert the elements if there is a miss.
# Python3 code to demonstrate# Finding missing elements in List# using list comprehension # initializing listtest_list = [3, 5, 6, 8, 10] # printing original listprint("The original list : " + str(test_list)) # using list comprehension# Finding missing elements in Listres = [ele for ele in range(max(test_list)+1) if ele not in test_list] # print resultprint("The list of missing elements : " + str(res)) |
The original list : [3, 5, 6, 8, 10] The list of missing elements : [0, 1, 2, 4, 7, 9]
Method #2 : Using set()
This problem can also be performed using the properties of difference of set and then getting the elements that are missing in a range.
# Python3 code to demonstrate# Finding missing elements in List# Using set() # initializing listtest_list = [3, 5, 6, 8, 10] # printing original listprint("The original list : " + str(test_list)) # Using set()# Finding missing elements in Listres = list(set(range(max(test_list) + 1)) - set(test_list)) # print resultprint("The list of missing elements : " + str(res)) |
The original list : [3, 5, 6, 8, 10] The list of missing elements : [0, 1, 2, 4, 7, 9]
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