concat a list in python code example

Example 1: join lists python

first_list = ["1", "2"]
second_list = ["3", "4"]

# Multiple ways to do this:
first_list += second_list
first_list = first_list + second_list
first_list.extend(second_list)

Example 2: merge lists in list python

import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))

Example 3: python concatenate list of lists

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

result = sum(x, [])

Example 4: how to concatenate two lists in python

listone = [1,2,3]
listtwo = [4,5,6]

joinedlist = listone + listtwo