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Python – Maximum difference across lists
• Last Updated : 24 Jan, 2021

Given two lists, the task is to write a Python program to find maximum difference among like index elements.

Examples:

Input : test_list1 = [3, 4, 2, 1, 7], test_list2 = [6, 2, 1, 9, 1]

Output : 8

Explanation : 9 – 1 = 8 is maximum differece across lists in same index.

Input : test_list1 = [3, 4, 2, 1, 17], test_list2 = [6, 2, 1, 9, 1]

Output : 16

Explanation : 17 – 1 = 16 is maximum differece across lists in same index.

Method 1 : Using list comprehension + max()

In this, difference is computed using abs() and iteration is done using list comprehension. The max() is used for the task of getting maximum difference among computed sub result.

## Python3

 `# Python3 code to demonstrate working of``# Maximum difference across lists``# Using list comprehension + max()`` ` `# initializing lists``test_list1 ``=` `[``3``, ``4``, ``2``, ``1``, ``7``]``test_list2 ``=` `[``6``, ``2``, ``1``, ``9``, ``1``]`` ` `# printing original lists``print``(``"The original list 1 is : "` `+` `str``(test_list1))``print``(``"The original list 2 is : "` `+` `str``(test_list2))`` ` `# using max() to get maximum of extracted difference``res ``=` `max``(``abs``(test_list2[idx] ``-` `test_list1[idx])``          ``for` `idx ``in` `range``(``0``, ``len``(test_list1) ``-` `1``))`` ` `# printing result``print``(``"Maximum difference among lists : "` `+` `str``(res))`

Output:

```The original list 1 is : [3, 4, 2, 1, 7]
The original list 2 is : [6, 2, 1, 9, 1]
Maximum difference among lists : 8```

Method 2 : Using zip() + max()

In this pairing of like index elements is done using zip(). Rest all the functionality is similar to above method.

## Python3

 `# Python3 code to demonstrate working of``# Maximum difference across lists``# Using zip() + max()`` ` `# initializing lists``test_list1 ``=` `[``3``, ``4``, ``2``, ``1``, ``7``]``test_list2 ``=` `[``6``, ``2``, ``1``, ``9``, ``1``]`` ` `# printing original lists``print``(``"The original list 1 is : "` `+` `str``(test_list1))``print``(``"The original list 2 is : "` `+` `str``(test_list2))`` ` `# using max() to get maximum of extracted difference``# zip() used to bind elements``res ``=` `max``(``abs``(ele1 ``-` `ele2) ``for` `ele1, ele2 ``in` `zip``(test_list1, test_list2))`` ` `# printing result``print``(``"Maximum difference among lists : "` `+` `str``(res))`

Output:

```The original list 1 is : [3, 4, 2, 1, 7]
The original list 2 is : [6, 2, 1, 9, 1]
Maximum difference among lists : 8```

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