What is the fastest way to merge two lists in python?

Question

Given,

list_1 = [1,2,3,4]
list_2 = [5,6,7,8]

What is the fastest way to achieve the following in python?

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Answer 1

a=[1,2,3]
b=[4,5,6]

c=a+b
print(c)

OUTPUT:

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

In the above code "+" operator is used to concatenate the 2 lists into a single list.

ANOTHER SOLUTION:

 a=[1,2,3]
 b=[4,5,6]
 c=[] #Empty list in which we are going to append the values of list (a) and (b)

 for i in a:
     c.append(i)
 for j in b:
     c.append(j)

 print(c)

OUTPUT:

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