is parameter an iterable?

Rick Wotnaz desparn at
Wed Nov 16 15:06:01 CET 2005

Steven D'Aprano <steve at> wrote in
news:pan.2005. at 

> def foo(inputVal):
>     try:
>         for val in inputVal:
>             # do stuff
>     except TypeError, msg:
>         if msg == "iteration over non-sequence":
>             # handle non-iterable case
>         else:
>             # some other TypeError is a bug, so re-raise the
>             exception raise

Does this in fact work on your system? On mine (2.4.1 (#65, Mar 30 
2005, 09:13:57) [MSC v.1310 32 bit (Intel)]), it doesn't seem to. I 
    	if msg.find("iteration over non-sequence") >= 0:
... but I got a traceback, and 
AttributeError: TypeError instance has no attribute 'find'
... which leads me to belive that 'msg' is not type(str). It can be 
coerced (str(msg).find works as expected). But what exactly is msg? 
It appears to be of <type 'instance'>, and does not test equal to a 
string. This is not the least surprise to me.


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