Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.

Python Python Basics Functions and Looping Raise an Exception

Joshua Faisal
Joshua Faisal
2,397 Points

I am really confused how to know if product_idea is less than 3 characters. Can someone please explain it to me?

suggestinator.py
def suggest(product_idea):
    return product_idea + "inator"
    if len(product_idea) < 3:
        raise ValueError

1 Answer

Hi Joshua!

Your if statement is the correct test to see if the product_idea string is long enough (or not).

Your logic (order of operation) is out-of-proper-sequence, though.

You want to first test the string length.

Then, if it's too short, raise the exception.

But, if it isn't (think: else), then concatenate "inator" to it and return it.

Like this:

def suggest(product_idea):
    if len(product_idea) < 3:
        raise ValueError("Name must be a least 3 characters long.")
    else:
        return product_idea + "inator"

That passed.

I also tested it here:

https://www.katacoda.com/courses/python/playground

Using this code:

def suggest(product_idea):
    if len(product_idea) < 3:
        raise ValueError("Name must be a least 3 characters long.")
    else:
        return product_idea + "inator"

print( suggest("Term")) # pass

print("") # blank line

print( suggest("TM")) # fail

Ran it like this:

root@e6d2d7627308:/root# python3 app.py

And got this (expected/correct result):

Terminator

Traceback (most recent call last):
  File "app.py", line 11, in <module>
    print( suggest("TM")) # fail
  File "app.py", line 3, in suggest
    raise ValueError("Name must be a least 3 characters long.")
ValueError: Name must be a least 3 characters long.

I hope that helps.

Stay safe and happy coding!