Here is how to concatenate two lists in Python.

list1 = [1, 2, 3]
list2 = [4, 5, 6]
concatenated_list = list1 + list2

# concatenated_list will be [1, 2, 3, 4, 5, 6] 

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In Python, you can concatenate two or more lists using the '+' operator.

Alternatively, you can use the extend() method to add the items of one list to another. For example:

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

# list1 will be [1, 2, 3, 4, 5, 6]

*It's important to note that concatenation using the '+' operator creates a new list, while using extend() modifies the original list in place. This means that the '+' operator is more efficient when you want to create a new list from two existing lists, while extend() is more efficient when you want to modify an existing list.

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