Python Program to Make a Flattened List from Nested List

 my_list = [[1], [2, 3], [4, 5, 6, 7]]

flat_list = [num for sublist in my_list for num in sublist]

print(flat_list)

Example 2: Using Nested for Loops (non pythonic way)

my_list = [[1], [2, 3], [4, 5, 6, 7]]

flat_list = []

for sublist in my_list:

    for num in sublist:

        flat_list.append(num)

print(flat_list)

Example 3: Using itertools package

import itertools

my_list = [[1], [2, 3], [4, 5, 6, 7]]

flat_list = list(itertools.chain(*my_list))

print(flat_list)

Example 4: Using sum()

my_list = [[1], [2, 3], [4, 5, 6, 7]]

flat_list = sum(my_list, [])

print(flat_list)

Example 5: Using lambda and reduce()

from functools import reduce

my_list = [[1], [2, 3], [4, 5, 6, 7]]

print(reduce(lambda x, y: x+y, my_list))

Output

[1, 2, 3, 4, 5, 6, 7]