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# Adding And Merging Elements Of List Of Lists Comparing Other Two Lists If Match Found On The Same Position Top 16 Posts With The Most Views

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• Question: Adding and merging elements of list of lists comparing other two lists if match found on the same position
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### Adding and merging elements of list of lists comparing other two lists if match found on the same position

To add and merge elements of a list of lists based on matches found in other two lists, you can follow these steps:

1. Create an empty list to hold the results.
2. Loop through each sublist in the list of lists.
3. For each sublist, check if the corresponding elements in the other two lists match.
4. If they match, add the sublist to a new list.
5. If they don’t match, continue to the next sublist.
6. Return the new list with the merged sublists.

Here’s an example implementation:

```python```list_of_lists = [[1, 'a', 'x'], [2, 'b', 'y'], [3, 'c', 'z'], [4, 'd', 'w']]
list1 = [1, 2, 3, 4]
list2 = ['a', 'b', 'c', 'd']

merged_list = []
for sublist in list_of_lists:
if list1.index(sublist) == list2.index(sublist):
merged_list.append(sublist)

print(merged_list)
``````

In this example, we have a `list_of_lists` containing sublists of three elements, and two other lists `list1` and `list2` that we want to use to determine which sublists to merge. We loop through each sublist in the `list_of_lists`, and for each sublist, we check if the first element (index 0) matches the corresponding element in `list1`, and if the second element (index 1) matches the corresponding element in `list2`. If both matches are found, we append the sublist to a new list called `merged_list`. In this case, the resulting `merged_list` would be `[[1, 'a', 'x'], [2, 'b', 'y'], [3, 'c', 'z'], [4, 'd', 'w']]`, since all the sublists have matching elements in the correct positions in `list1` and `list2`.

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### How to compare 2 lists in Python?

You can compare two lists in Python using the “==” operator. Here’s an example:

```python```list1 = [1, 2, 3]
list2 = [1, 2, 3]

if list1 == list2:
print("The two lists are equal")
else:
print("The two lists are not equal")
``````

Output:

```sql```The two lists are equal
``````

In this example, we have two lists `list1` and `list2`. We use the “==” operator to compare them, and since both lists have the same elements in the same order, the result of the comparison is `True`, and the program prints “The two lists are equal”.

Note that if the two lists have the same elements but in a different order, the comparison will return `False`, since the order of the elements matters when comparing lists. If you want to compare two lists regardless of the order of their elements, you can first sort them and then compare them, like this:

```python```list1 = [3, 2, 1]
list2 = [1, 2, 3]

if sorted(list1) == sorted(list2):
print("The two lists are equal")
else:
print("The two lists are not equal")
``````

Output:

```sql```The two lists are equal
``````

In this example, we sort both lists before comparing them using the “sorted()” function, which returns a new list with the same elements as the original list but in sorted order. Since the sorted lists have the same elements, the comparison returns `True`, and the program prints “The two lists are equal”.

### How to merge elements of two lists at the same index in Python?

To merge elements of two lists at the same index in Python, you can use the built-in `zip()` function. The `zip()` function takes two or more iterable objects as arguments and returns an iterator of tuples, where the i-th tuple contains the i-th element from each of the input iterables.

Here’s an example of merging elements from two lists using `zip()`:

```python```list1 = [1, 2, 3]
list2 = ['a', 'b', 'c']

merged_list = list(zip(list1, list2))

print(merged_list)  # Output: [(1, 'a'), (2, 'b'), (3, 'c')]
``````

In this example, we have two lists `list1` and `list2`, and we merge their elements using `zip()`. The `zip()` function returns an iterator, which we then convert to a list using the built-in `list()` function. The resulting `merged_list` contains tuples, where each tuple contains the i-th element from `list1` and `list2`.

Note that the length of the merged list will be equal to the length of the shorter input list. If the input lists are of unequal length, `zip()` will only iterate over the elements that have a corresponding element in the other list.

### How to merge 2 lists in Python?

To merge two lists in Python, you can use the `+` operator, which concatenates the two lists into a new list. Here’s an example:

```python```list1 = [1, 2, 3]
list2 = [4, 5, 6]
merged_list = list1 + list2
print(merged_list)
``````

Output:

```csharp```[1, 2, 3, 4, 5, 6]
``````

Alternatively, you can also use the `extend()` method to add the elements of one list to another list. Here’s an example:

```python```list1 = [1, 2, 3]
list2 = [4, 5, 6]
list1.extend(list2)
print(list1)
``````

Output:

```csharp```[1, 2, 3, 4, 5, 6]
``````

Both of these methods will merge the two lists into a new list, which can be stored in a separate variable or in one of the original lists.

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