Split Array and Add First Part to End in Python

When it is required to split the list, and then add this first part to the end of the list, a simple iteration through the list and list slicing is required.

A list can be used to store heterogeneous values (i.e data of any data type like integer, floating point, strings, and so on).

Below is a demonstration for the same −

Example

 Live Demo

def split_list(my_list, n_val, k_val):
   for i in range(0, k_val):
      first_val = my_list[0]
      for k in range(0, n_val-1):
         my_list[k] = my_list[k + 1]
      my_list[n_val-1] = first_val
my_list = [34, 42, 56, 78, 9, 0, 23]
list_len = len(my_list)
pos = 3
print("The list is :")
print(my_list)
print("The split_list method is being called")
split_list(my_list, list_len, pos)
for i in range(0, list_len):
print(my_list[i])

Output

The list is :
[34, 42, 56, 78, 9, 0, 23]
The split_list method is being called
78
9
0
23
34
42
56

Explanation

• A method named ‘split_list’ is defined, that takes a list, and two values as parameters.
• Using simple indexing, the array is split, and the first part of the list is put to the end of the list.
• A list is created, and is displayed on the screen.
• This method is called by passing the list as parameter.
• The output is displayed on the console.