Python | Split string in groups of n consecutive characters

Given a string (be it either string of numbers or characters), write a Python program to split the string by every n^th character. 

Examples: 

Input : str = "Geeksforgeeks", n = 3
Output : ['Gee', 'ksf', 'org', 'eek', 's']

Input : str = "1234567891234567", n = 4
Output : [1234, 5678, 9123, 4567]

Method #1: Using list comprehension

Python3

# Python code to split string
# by every 3rd number

# String initialization
string = "Geeksforgeeks"

# Defining splitting point
n = 3

# Using list comprehension
out = [(string[i:i+n]) for i in range(0, len(string), n)]

# Printing output
print(out)

Method #2: Using zip_longest

Python3

# Python code to split string of number
# and character into every 4th number

# Importing
from itertools import zip_longest

# Group function using zip_longest to split
def group(n, iterable, fillvalue=None):
    args = [iter(iterable)] * n
    return zip_longest(fillvalue=fillvalue, *args)

# String initialization
str = '123GeeksForGeeks4567'

# Split point
n=4

# list of separated string
out_string = [''.join(lis) for lis in group(n, str, '')]

# Output list initialization
out_no = []

# Converting list of string into list of integer
for a in out_string:
    out_no.append(a)

# Printing list
print(out_no)

Output

['123G', 'eeks', 'ForG', 'eeks', '4567']

Method 3: Using a for loop and string slicing.

• Initialize an empty list to store the substrings.
• Define the splitting point, i.e., n=3.
• Create a for loop to iterate over the string.
• In each iteration, append the substring to the list using string slicing.
• Print the output list.

Python3

# Python code to split string
# by every 3rd number

# String initialization
string = "Geeksforgeeks"

# Defining splitting point
n = 3

# Using for loop and string slicing
out = []
for i in range(0, len(string), n):
    out.append(string[i:i+n])

# Printing output
print(out)

Output

['Gee', 'ksf', 'org', 'eek', 's']

Time complexity: O(n), where n is the length of the input string. 
Auxiliary space: O(n), as we are storing each substring in a list.