CODEWITHSUNDEEP
python
Liedakkala
Liedakkala

Reputation: 428

How do I handle a ValueError?

I'm using index() on a string to find the occurrence of a substring.

When the substring does not exist within the string, I get:

"ValueError: substring not found".

I want my program to be able to recognize when this is happening, but I don't know how to turn the ValueError into something useful. For example, how can I use getting a ValueError in an if statement?

Upvotes: 2

Views: 3926

Answers (2)

jurgenreza
jurgenreza

Reputation: 6086

Generally you could use try and except for catching exceptions but in this case as mentioned by John you could just use find().

try:
   #your code that raises the exception
except ValueError:
   #turn it into something useful

Upvotes: 7

John Zwinck
John Zwinck

Reputation: 249123

Don't wait for the exception. Use find() instead of index() and you will avoid having exceptions at all. Just test for not-found and be done with it.

Upvotes: 5

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