python get first n elements of list

1a=list((1, 2, 3))
2n=1
3a[:n]
4
5output:
6[1]

1l = [1, 2, 3, 4, 5]
2print(l[:3])

1# Python3 code to demonstrate  
2# to get first and last element of list 
3# using list indexing 
4  
5# initializing list  
6test_list = [1, 5, 6, 7, 4] 
7  
8# printing original list  
9print ("The original list is : " +  str(test_list)) 
10  
11# using list indexing 
12# to get first and last element of list 
13res = [ test_list[0], test_list[-1] ]  
14  
15# printing result 
16print ("The first and last element of list are : " +  str(res)) 

1some_list[0]

1an_array = [1,2,3,4,5]
2first element = an_array[0]