Python string find() method example

In this source code example, we will demonstrate how to use the Python string find() method effectively to find a substring in a string.

Python string find() method

The find() is a string method that finds a substring in a string and returns the index of the substring.

The following illustrates the syntax of the find() method:
str.find(sub[, start[, end]])
The find() method accepts three parameters:
  • sub is the substring to look for in the str.
  • start and end parameters are interpreted as in the slice str[start:end], which specifies where to search for the substring sub.

Python string find() method examples

The following example shows how to use the find() method to find the substring 'Source' in the string 'Source Code Examples':

s = 'Source Code Examples'
result = s.find('Source')

print(result)

Output:

0
The following example uses the find() method to locate the substring 'Source' in the string 'Source Source Code Examples' within the slice str[1:]:

s = 'Source Source Code Examples'
result = s.find('Source', 1)

print(result)

Output:

7
The following example returns -1 because the substring 'Python' doesn’t exist in the string 'Source Code Examples':

s = 'Source Code Examples'
result = s.find('Python')

print(result)

Output:

-1

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