Using .split() And .join() In Python

I am currently learning some Python in Treehouse, but I came upon this challenge and do not know what I am doing wrong. The challenge is split into three parts, shown below with th

Solution 1:

You should use

display_menu = ", ".join(sundaes)

sundaes is a list and it doesn't have .join, you can check by opening a python interpreter and running :

>>> dir(list)

but the string object hast .join

>>> dir(str)

and by running

>>> help(str.join)

we can see the description Help on method_descriptor:

join(...)
S.join(iterable) -> string

Return a string which is the concatenation of the strings in the
iterable.  The separator between elements is S.