Example 1: python how to add one list to another list
# Basic syntax:
first_list.append(second_list) # Append adds the the second_list as an
# element to the first_list
first_list.extend(second_list) # Extend combines the elements of the
# first_list and the second_list
# Note, both append and extend modify the first_list in place
# Example usage for append:
first_list = [1, 2, 3, 4, 5]
second_list = [6, 7, 8, 9]
first_list.append(second_list)
print(first_list)
--> [1, 2, 3, 4, 5, [6, 7, 8, 9]]
# Example usage for extend:
first_list = [1, 2, 3, 4, 5]
second_list = [6, 7, 8, 9]
first_list.extend(second_list)
print(first_list)
--> [1, 2, 3, 4, 5, 6, 7, 8, 9]
Example 2: python merge list of lists
flat_list = [item for sublist in t for item in sublist]
Example 3: merge two sorted lists python
from heapq import merge
# initializing lists
test_list1 = [1, 5, 6, 9, 11]
test_list2 = [3, 4, 7, 8, 10]
# printing original lists
print ("The original list 1 is : " + str(test_list1))
print ("The original list 2 is : " + str(test_list2))
# using heapq.merge()
# to combine two sorted lists
res = list(merge(test_list1, test_list2))
# printing result
print ("The combined sorted list is : " + str(res))