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Showing content from https://www.w3schools.com/python/gloss_python_join_lists.asp below:

Python Join Two Lists

There are several ways to join, or concatenate, two or more lists in Python.

One of the easiest ways are by using the + operator.

Example

Join two list:

list1 = ["a", "b" , "c"]

list2 = [1, 2, 3]

list3 = list1 + list2

print(list3)

Another way to join two lists are by appending all the items from list2 into list1, one by one:

Example

Append list2 into list1:

list1 = ["a", "b" , "c"]

list2 = [1, 2, 3]

for x in list2:

list1.append(x)

print(list1)

Or you can use the extend() method, which purpose is to add elements from one list to another list:

Example

Use the extend() method to add list2 at the end of list1:

list1 = ["a", "b" , "c"]

list2 = [1, 2, 3]

list1.extend(list2)

print(list1)

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