# Python | Maximum sum of list items in a list of lists

Examples:

` Input: [[1, 2, 3], [4, 5, 6], [10, 11, 12], [7, 8, 9]] Output: 33 Explanation: sum of all lists in the given list of lists are: list1 = 6, list2 = 15, list3 = 33, list4 = 24 so the maximum among these is of Input: [[3, 4, 5], [1, 2, 3], [0, 9, 0]] Output: 12 `

Method 1: list traversal in lists

We can move through the lists within the list and sum all the elements in the given list and use the max function to get the maximum sum of all the elements in the lists of the list.

 ` # Python program to search ` ` # list in the list of lists whose ` ` # sum elements highest ` ` # use bypass `   ` de f ` ` maximumSum (list1): ` ` maxi ` ` = ` ` 0 ` ` `  ` # crawl lists ` ` for ` ` x ` ` in ` ` list1: ` ` sum ` ` = ` ` 0 `  ` # crawl list of lists ` ` for ` ` y ` ` in ` ` x: ` ` sum ` + ` = ` ` y ` ` ` ` maxi ` ` = ` ` max ` ` (` ` sum ` `, maxi) ` ` `  ` ` ` return ` ` maxi `   ` # driver code ` ` list1 ` ` = ` ` [[` ` 1 ` `, ` ` 2 ` `, ` ` 3 ` `], [` ` 4 ` `, ` ` 5 ` `, ` ` 6 ], [ 10 , 11 , 12 ], [ 7 , 8 , 9 ]] `` print maximumSum (list1) `

Exit:

` 33 `

Method 2: traversing the list

Traverse only the outer list and sum all the elements in the inner lists using the

` # Program mma Python to search `
` # list in the list of lists whose `
` # the sum of the elements is the highest `
` # using sum and max function and bypass `

` def ` ` maximumSum (list1): `

` maxi ` ` = ` ` 0 `

` # workaround `

` for ` ` x ` ` in ` ` list1: `

` maxi ` ` = ` ` max ` ` (` ` sum ` ` (x) , maxi) `

` return ` ` maxi `

` # driver code `

` list1 ` ` = ` ` [[` ` 1 ` ` , ` ` 2 ` `, ` ` 3 ` `], [` ` 4 ` `, ` ` 5 ` `, ` ` 6 ` `], [` ` 10 ` `, ` ` 11 ` `, ` ` 12 ` `], [` ` 7 ` `, ` ` 8 ` `, ` ` 9 ` `]] `

` print ` ` maximumSum (list1) `

Exit:

` 33 `

Method 3: Sum and Max Function

`  sum (max (list1, key = sum))  `

The above function syntax max () allows us to find the sum of a list in a list using key = sum max (list1, key = sum) , this finds the list with the maximum sum of elements, and then sum (max (list1, key = sum)) returns us the sum of that list.

` `

` # Python program to search # list in the list of lists whose # the sum of the elements is the highest # using the sum and max function   def maximumSum (list1): return ( sum ( max (list1, key = sum )))     # driver code list1 = [[ 1 , 2 , 3 ], [ 4 , 5 , 6 ], [ 10 , 11 , 12 ], [ 7 , 8 , 9 ]] prin t maximumSum (list1) `

` `

Exit :

` 33 `

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