Python | Get all substrings of a given string

Michael Zippo 18.07.2021

Method # 1: Using a list of lists + slicing strings
A combination of list comprehension and slicing strings can be used to accomplish this particular task. It’s just a brute force method to accomplish this task.

# Python3 code to demonstrate how it works
# Get all substrings of a string
# Using comprehension list + line slice

# initialization string

test_str = "Geeks"

# print original string

print ( "The original string is:" + str (test_str))

< code class = "comments"> # Get all substrings of a string
# Using comprehension list + line slice

res = [test_str [i: j] for i in range ( len (test_str))

for j in range (i + 1 , len (test_str) + 1 )]

# print result

print ( "All substrings of string are:" + str (res))

Output:

The original string is: Geeks
All substrings of string are: [’G’, ’Ge’, ’Gee’, ’Geek’, ’Geeks’, ’e’, ’ee’, ’eek’, ’eeks’, ’e’, ’ek’, ’eks’, ’k’, ’ks’, ’s’]

Method # 2: Using itertools.combinations()
This particular task can also be done using the built-in combination function, which helps to get all possible combinations, i.e. substrings from a string.

Output:

The original string is: Geeks
All substrings of string are: [’G’, ’ Ge ’,’ Gee ’,’ Geek ’,’ Geeks’, ’e’, ’ee’, ’eek’, ’eeks’,’ e ’,’ ek ’,’ eks’, ’k’, ’ks’ , ’s’]