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Python – Check if elements index are equal for list elements
• Last Updated : 02 Sep, 2020

Given two lists and check list, test if for each element in check list, elements occur in similar index in 2 lists.

Input : test_list1 = [2, 6, 9, 7, 8], test_list2 = [2, 7, 9, 4, 8], check_list = [9, 8, 7]
Output : False
Explanation : 7 is at 4th and 2nd place in both list, hence False.

Input : test_list1 = [2, 6, 9, 7, 8], test_list2 = [2, 6, 9, 4, 8], check_list = [9, 8, 6]
Output : True
Explanation : All from checklist at similar index, hence True.

Method #1 : Using loop

In this, we iterate for all the elements in list, if elements are different and is present in check list, then False is returned.

## Python3

 `# Python3 code to demonstrate working of ``# Check if elements index are equal for list elements``# Using loop`` ` `# initializing lists``test_list1 ``=` `[``2``, ``6``, ``9``, ``7``, ``8``]``test_list2 ``=` `[``2``, ``7``, ``9``, ``4``, ``8``]`` ` `# printing original lists``print``(``"The original list 1 : "` `+` `str``(test_list1))``print``(``"The original list 2 : "` `+` `str``(test_list2))`` ` `# initializing check_list``check_list ``=` `[``9``, ``8``, ``2``]`` ` `res ``=` `True` `for` `idx, ele ``in` `enumerate``(test_list1):``     ` `    ``# check for indifference and containment``    ``if` `test_list1[idx] !``=` `test_list2[idx] ``and` `ele ``in` `check_list:``        ``res ``=` `False` `        ``break``     ` `# printing result ``print``(``"Are elements at same index for required instances ?:  "` `+` `str``(res))`
Output
```The original list 1 : [2, 6, 9, 7, 8]
The original list 2 : [2, 7, 9, 4, 8]
Are elements at same index for required instances ?:  True
```

Method #2 : Using zip() + all() + generator expression

In this, we pair like indices using zip() and then all() is used to check for all indices, generator expression is used for iteration logic.

## Python3

 `# Python3 code to demonstrate working of ``# Check if elements index are equal for list elements``# Using zip() + all() + generator expression`` ` `# initializing lists``test_list1 ``=` `[``2``, ``6``, ``9``, ``7``, ``8``]``test_list2 ``=` `[``2``, ``7``, ``9``, ``4``, ``8``]`` ` `# printing original lists``print``(``"The original list 1 : "` `+` `str``(test_list1))``print``(``"The original list 2 : "` `+` `str``(test_list2))`` ` `# initializing check_list``check_list ``=` `[``9``, ``8``, ``2``]`` ` `# checking for all elements equal in check list using all()``res ``=` `all``(a ``=``=` `b ``for` `a, b ``in` `zip``(test_list1, test_list2) ``if` `a ``in` `check_list)``     ` `# printing result ``print``(``"Are elements at same index for required instances ?:  "` `+` `str``(res))`
Output
```The original list 1 : [2, 6, 9, 7, 8]
The original list 2 : [2, 7, 9, 4, 8]
Are elements at same index for required instances ?:  True
```

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