Python concatenation Question problem

Gabriel Cooper gabriel.cooper at
Tue Oct 5 23:05:39 CEST 2004

Kory Wheatley wrote:

> I have the the following string variable called *mlist  *that contains 
> the value *ccinfolist *here is what I've tried to do to join this 
> variable with another string value.
> First attempt
> url = + mlist
> error I receive:
> *TypeError: cannot add type "instance" to string mlist*

Well, the first line you mention above, the URL itself should have been 
in quotes. However I assume you actually did so and just didn't type 
them into the email since otherwise you'd have a syntax error! At any 
rate, you need to figure out what exactly "mlist" is. Since it says it's 
an "instance" that means it's an instance of a class, and not a string. 
So... If this sounds correct, then you'll need to simply use this instead:

url = "" + str(mlist)

You'll probably need to define the __str__ method if it's not defined 
already in your class.


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