Python – Consecutive Missing elements Sum

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 summation of all the missing elements. Let’s discuss certain ways in which this can be done.

Method #1 : Using list comprehension + sum()
We can perform the task of finding missing elements using the the range function to get the maximum element fill and then insert the elements if there is a miss. The summation is performed using sum().

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# Python3 code to demonstrate
# Consecutive Missing elements Sum
# using list comprehension + sum()
  
# initializing list
test_list = [3, 5, 6, 8, 10]
  
# printing original list
print("The original list : " + str(test_list))
  
# using list comprehension + sum()
# Consecutive Missing elements Sum
res = sum([ele for ele in range(max(test_list) + 1) if ele not in test_list])
  
# print result
print("The sum of missing elements : " + str(res))

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Output :

The original list : [3, 5, 6, 8, 10]
The sum of missing elements : 23

 

Method #2 : Using set() + sum()
This problem can also be performed using the properties of difference of set and then getting the elements that are missing in a range. The summation is performed using sum().



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code

# Python3 code to demonstrate
# Consecutive Missing elements Sum
# Using set() + sum()
  
# initializing list
test_list = [3, 5, 6, 8, 10]
  
# printing original list
print("The original list : " + str(test_list))
  
# Using set() + sum()
# Consecutive Missing elements Sum
res = sum(list(set(range(max(test_list) + 1)) - set(test_list)))
  
# print result
print("The sum of missing elements : " + str(res))

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Output :

The original list : [3, 5, 6, 8, 10]
The sum of missing elements : 23

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