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Python Python Basics (2015) Python Data Types Use .split() and .join()

Why does it say task one is no longer passed if it is?

Why? Just, WHY????

banana.py
available = "banana split;hot fudge;cherry;malted;black and white"
sundaes = available.split(";")
menu = "Our available flavors are: {}".format(sundaes.join(", "))

3 Answers

Steven Parker
Steven Parker
230,248 Points

You get that message anytime you introduce a syntax error.

Since the challenge re-tests task 1 first, a syntax error will cause it to fail.

In this case you have applied join to a sequence and given it a string argument, but join is actually a string method that takes a sequence argument.

Kenneth Love
STAFF
Kenneth Love
Treehouse Guest Teacher

Each time you submit code for the code challenge, all of the previous steps are re-run. So when you submit task #3, the challenge engine runs task #1, then task #2, then, finally, task #3. So if code you wrote in task #3 breaks task #1, you'll get the error message that you got. I added a bit of extra error checking to help people find the problem you encountered.

But let's talk about what happened in your code. It's a very common mistake. You're doing sundaes.join(), but sundaes is a list and the .join() method belongs to strings, not lists.

Why does it work if instead I put "string".format(", ".join(sundaes)) if sundaes is still a list?

Kenneth Love
Kenneth Love
Treehouse Guest Teacher

That's how join works. It's a method that belongs to strings. ", " is a string. So ", ".join() says "take this string and use it to combine everything in this list". The list that's being joined is sundaes.