How to merge multiple lists into one list in python?

How to merge multiple lists into one list in python?

To merge multiple lists into one list in Python, you can use several approaches, such as list concatenation, the extend() method, or the + operator. Here are three common methods to achieve this:

Method 1: Using List Concatenation

You can use the + operator to concatenate multiple lists into one:

list1 = [1, 2, 3] list2 = [4, 5, 6] list3 = [7, 8, 9] merged_list = list1 + list2 + list3

Method 2: Using List extend() Method

You can use the extend() method to add elements from one list to another:

list1 = [1, 2, 3] list2 = [4, 5, 6] list3 = [7, 8, 9] merged_list = [] merged_list.extend(list1) merged_list.extend(list2) merged_list.extend(list3)

Method 3: Using a List Comprehension

You can use a list comprehension to merge multiple lists into one:

list1 = [1, 2, 3] list2 = [4, 5, 6] list3 = [7, 8, 9] merged_list = [item for sublist in [list1, list2, list3] for item in sublist]

All three methods will give you the same result, which is a single list containing all the elements from the original lists:

print(merged_list) # Output: [1, 2, 3, 4, 5, 6, 7, 8, 9]

Choose the method that best fits your coding style and requirements.

Examples

  1. How to merge multiple lists into one list in Python?

    Description: This query seeks a straightforward method to combine multiple lists into a single list.

    # Define multiple lists list1 = [1, 2, 3] list2 = ['a', 'b', 'c'] list3 = [True, False] # Merge lists into one list merged_list = list1 + list2 + list3 print(merged_list)

  2. Python merge lists into one list and remove duplicates.

    Description: This query involves merging multiple lists into one list while ensuring that duplicate elements are removed.

    # Define multiple lists with duplicates list1 = [1, 2, 3] list2 = [3, 4, 5] list3 = [5, 6, 7] # Merge lists and remove duplicates merged_list = list(set(list1 + list2 + list3)) print(merged_list)

  3. How to concatenate multiple lists into one list in Python?

    Description: This query aims to concatenate multiple lists into a single list.

    # Define multiple lists list1 = [1, 2, 3] list2 = ['a', 'b', 'c'] list3 = [True, False] # Concatenate lists into one list merged_list = list1 + list2 + list3 print(merged_list)

  4. Python merge lists and preserve order.

    Description: This query involves merging multiple lists into one list while preserving the order of elements.

    from itertools import chain # Define multiple lists list1 = [1, 2, 3] list2 = ['a', 'b', 'c'] list3 = [True, False] # Merge lists and preserve order merged_list = list(chain(list1, list2, list3)) print(merged_list)

  5. How to merge lists and keep only unique elements in Python?

    Description: This query aims to merge multiple lists into one list while retaining only unique elements.

    # Define multiple lists with duplicates list1 = [1, 2, 3] list2 = [3, 4, 5] list3 = [5, 6, 7] # Merge lists and keep only unique elements merged_list = list(set(list1 + list2 + list3)) print(merged_list)

  6. Python merge lists and sort the resulting list.

    Description: This query involves merging multiple lists into one list and sorting the resulting list.

    # Define multiple lists list1 = [3, 2, 1] list2 = ['c', 'b', 'a'] list3 = [False, True] # Merge lists and sort the resulting list merged_list = sorted(list1 + list2 + list3) print(merged_list)

  7. How to merge lists of different types into one list in Python?

    Description: This query aims to merge multiple lists of different data types into a single list.

    # Define multiple lists of different types list1 = [1, 2, 3] list2 = ['a', 'b', 'c'] list3 = [True, False] # Merge lists into one list merged_list = list1 + list2 + list3 print(merged_list)

  8. Python merge lists and flatten nested lists.

    Description: This query involves merging multiple lists into one list and flattening any nested lists.

    from itertools import chain # Define multiple lists with nested lists list1 = [1, [2, 3], 4] list2 = ['a', ['b', 'c'], 'd'] list3 = [True, [False, True], False] # Merge lists and flatten nested lists merged_list = list(chain.from_iterable([x if isinstance(x, list) else [x] for x in list1 + list2 + list3])) print(merged_list)

  9. How to merge lists and handle empty lists in Python?

    Description: This query involves merging multiple lists into one list while handling empty lists gracefully.

    # Define multiple lists with some empty lists list1 = [1, 2, 3] list2 = [] list3 = [True, False] # Merge lists, ignoring empty lists merged_list = [elem for sublist in [list1, list2, list3] if sublist for elem in sublist] print(merged_list)

  10. Python merge lists and handle large datasets efficiently.

    Description: This query involves merging large volumes of lists efficiently using optimized methods or libraries like itertools.chain.

    from itertools import chain # Define multiple large lists list1 = [1] * 1000000 list2 = [2] * 1000000 list3 = [3] * 1000000 # Merge large lists efficiently merged_list = list(chain(list1, list2, list3)) print(len(merged_list)) # Output: 3000000

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