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substring not found

Substring not found Returns -1 in Python Handle with caution

python shell for substring not found

In Python, I search for a string within a string
But when the substring is not found, -1 is my friend
I must handle this case with care and grace
To avoid errors and keep my code in good embrace

I learned that in Python, when I am searching for a substring within a string and it is not found, the program returns a value of -1. This is important to note because it allows me to handle cases where the substring is not present in the string, and to avoid potential errors in my code. It’s crucial to remember that -1 is the default return value for the find() method when the substring is not found, and to write my code accordingly to account for this possibility. When dealing with substring not found, I need to be mindful of edge cases where the substring may be located at the beginning or end of the string, as well as cases where the substring is an empty string or when the entire string is empty.