# Python – Consecutive Missing elements Sum

• Last Updated : 21 Jun, 2022

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 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

 `# 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

 `# 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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