I have two list
l1= ["apple", "orange"]
l2 = ["red", green", "black", "blue"]
I want to create a list which appends both.
l3 = [["apple", "orange"], ["red", green", "black", "blue"]].
So the l3[0] =["apple", "orange"] and l3[1]=["red", green", "black", "blue"].
How do I do the above?
Just put the references in.
l3 = [l1, l2]
Note that, if you do this, modifying l1 or l2 will also produce the same changes in l3. If you don't want this to happen, use a copy:
l3 = [l1[:], l2[:]]
This will work for shallow lists. If they are nested, you're better off using deepcopy:
import copy
l3 = [copy.deepcopy(l1), copy.deepcopy(l2)]
Just do the following:
l3 = [l1, l2]
You want to use the .append() method.
First, create a new array, then append the first list, then the second:
l3 = []
l3.append(l1)
l3.append(l2)
This gives you:
l3 = [["apple", "orange"], ["red", green", "black", "blue"]]
You can also do this shorter method:
l3 = [l1, l2]
Either:
>>> l1= ["apple", "orange"]
>>> l2 =["red", "green", "black", "blue"]
>>> l3 = list()
>>> l3.append(l1)
>>> l3.append(l2)
>>> l3
[['apple', 'orange'], ['red', 'green', 'black', 'blue']]
use append() to append a list to your list 3
Or:
l3 = [l1, l2]
No matter which way you choose, the result:
>>> l3[0]
['apple', 'orange']
>>> l3[1]
['red', 'green', 'black', 'blue']
If you have:
l1 = [1,2,3]
l2 = [4,5,6]
You can do:
l3 = list()
l3.append(l1)
l3.append(l2)
or:
l3 = [l1,l2]