How to find Substring in a String in Python

In this article, we will learn to find a substring in a string in Python.

This can be done using the built-in Python method find().

The find() method returns the lowest index of the substring if it is found in given string. If its is not found then it returns -1.

Syntax : str.find(sub,start,end)

• sub : It’s the substring which needs to be searched in the given string.
• start : Starting position where sub is needs to be checked within the string.
• end : Ending position where suffix is needs to be checked within the string.

test = 'Python is so cool'

print('Substring "Python" found at index: ', test.find('Python'))

print('Substring "cool" found at index: ', test.find('cool')) 

if (test.find('and') == -1):
	print("Doesn't contain 'and' substring")
else:
	print("Substring 'and' is at index:", test.find('and'))

Output:

Substring "Python" found at index:  0
Substring "cool" found at index:  13
Doesn't contain 'and' substring