Banana split

Let's take a look at your code:

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

I see you might have trouble with the join method for strings, so here's a little recap.

Join is syntactically different than split in that it takes the joiner first then method call (.join) and in the argument, you put in a list you want to join. For example:

", ".join(some_list)

Another thing I see is that the += operator, while it works on strings, appends to a string. Here, sundaes is a list of available items (['banana split', 'hot fudge', 'cherry', 'malted', 'black and white']) ", ".join(some_list) creates a single string derived from the list of things joined by your joiner. for example

>>>", ".join(sundaes)
'banana split, hot fudge, cherry, malted, black and white'

so, what you want to do is join the list sundaes with the string ", " to make what we have above, and then assign that (not append) to the display_menu variable like such:

display_menu = ", ".join(sundaes)

The last thing you're missing is that if you read the question carefully, it asks you to reassign the menu variable, meaning you have to reassign the menu after you used .format() on it.

menu = menu.format(display_menu)

I hope that helps!