In this tutorial, we will see how to combine twolist in python
There are multiple ways to combine list in python.
Table of Contents
Using + operator
You can use + operator to combine list in python.
Let’s understand with the help of example.
list1=[1,2,3,4]
list2=[5,6,7,8]
combinedList = list1 + list2
print("Combined List:",combinedList)
Output:
As you can see combined list has joined list1 and list2
Using itertools.chain
Let’s understand with the help of example.
import itertools
list1=[10,20,30,40]
list2=[50,60,70,80]
for i in itertools.chain(list1,list2):
print(i)
Output:
20
30
40
50
60
70
80
There are two advantages of using this approach.
- You don’t have to create copy of list to iterate over elements
- You can combine other iterables such as set and tuple as well
Using Additional Unpacking Generalizations
There is another way to combine two lists in python>=3.5 version.Additional Unpacking Generalizations reduces synthetic sugar with * operator but it may not be very easy to understand. This approach is bit faster than other two.
list1=[10,20,30,40]
list2=[50,60,70,80]
combinedList=[*list1,*list2]
print("Combind list:",combinedList)
Output:
Remove duplicates in combined list
In case you want to remove duplicates in combined list, you can use + operator and then convert it to set and back to list.
list1=[10,20,30,40]
list2=[50,10,20,60]
combinedList=list(set(list1 + list2))
print("Combind list without duplicates:",combinedList)
Output:
That’s all about how to combine two lists in python
