How to Concatenate, Repeat, and Determine the Length of Lists

How can we concatenate two or more lists or repeat the contents of a list?

In Python, you can use the addition operator (+) to concatenate lists and the multiplication operator (*) to repeat them.

You can also use the len() function to find the length of a list.

You can concatenate two lists by using the + operator.

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fruits = ["apple", "banana"]
vegetables = ["carrot", "tomato"]

combined_list = fruits + vegetables

# ["apple", "banana", "carrot", "tomato"]
print("combined_list:", combined_list)

In the example above, the fruits and vegetables lists are concatenated using the + operator and stored in the combined_list.

The * operator repeats the elements of a list a specified number of times.

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fruits = ["apple", "banana"]

repeated_fruits = fruits * 2

# ["apple", "banana", "apple", "banana"]
print("repeated_fruits:", repeated_fruits)

In the example above, elements of the fruits list are repeated twice using the * operator and stored in repeated_fruits.

The len() function returns the number of elements that a list contains.

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fruits = ["apple", "banana"]

length = len(fruits) # Store the length of list fruits in variable length

print("length:", length)  # 2

Since there are 2 elements in the fruits list, the result of len(fruits) is 2.