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Python – Append List every Nth index
When it is required to append list every ‘N’th index, a simple iteration and the ‘enumerate’ attribute are used.
Example
Below is a demonstration of the same −
my_list = [13, 27, 48, 12, 21, 45, 28, 19, 63]
print("The list is :")
print(my_list)
append_list = ['P', 'Y', 'T']
N = 3
print("The value of N is ")
print(N)
my_result = []
for index, element in enumerate(my_list):
if index % N == 0:
for element_in in append_list:
my_result.append(element_in)
my_result.append(element)
print("The result is :")
print(my_result)Output
The list is : [13, 27, 48, 12, 21, 45, 28, 19, 63] The value of N is 3 The result is : ['P', 'Y', 'T', 13, 27, 48, 'P', 'Y', 'T', 12, 21, 45, 'P', 'Y', 'T', 28, 19, 63]
Explanation
A list is defined and displayed on the console.
Another integer list is defined.
The value for N is defined and displayed on the console.
An empty list is created.
The list is iterated over using ‘enumerate’, and every element is divided by N and its remainder is compared to 0.
If it is 0, the element is again checked if it is present in the integer list.
If yes, it is appended to the empty list.
This is the output that is displayed on the console.
Updated on: 08-Sep-2021
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