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Python – Consecutive Missing elements Sum
• Last Updated : 23 Jan, 2020

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().

 `# 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))`
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().

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

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