Question

PS9 I wrote this method for ShapeSet. This method will work but gives me this error.
Traceback (most recent call last):
File "", line 1, in TypeError: __str__ returned non-string (type NoneType) I think it I need to return not print but I don't know how do that. any ideas

Answer 1

This is the code I used to test ps9.py

Answer 2

yes, just have it return a string. ie.
def __str__(self):
return str(self.theVariableYouWantToPrint)

Answer 3

forgot to say, when you give the print command you are telling Python to go find and execute the __str__ variable for whatever object you called.

Answer 4

whoops, __str__ method I mean

Answer 5

ok that makes sense but I thought that I wanted to write a __str__ which returns the string representation for the set, which consists of the string representation of each shape categorized by type. To do that I would need to loop and print. If I did 'return' that would end the loop before I all the shapes have been printed, right?
It is possible I don't understand the question fully. Does the question really want me to set up a str so that when I could use __iter__ to print? However, If I set it up like this It would not print all the shape categorized by type. Or does categorized by type really just mean that I need to set __str__ up in a way that calls the respected class definition up the chain.

Answer 6

well this is what I came up with, I don't know if this is the best way to do it but it does work.
code: http://dpaste.com/531158/
test: http://dpaste.com/531157/

Answer 7

something happened between me copying and posting the code. here is what I ment to post.
REAL CODE: http://dpaste.com/531160/