problem using array of instances

[zenguyuno at yahoo.com]

I'm stuck on this one:

I defined a class, call it boat.

I created a list of instances, call it pop, so pop[i] is an instance of
the boat class, and I made pop[0], pop[1], etc., all boats.

The boat class has a method defined, call it go().

I want to define a function and pass i to it.  Then inside the function
I want it to call the go() method of the ith boat, like pop[i].next. 
This didn't work; Python thinks that pop[i] is an int, and doesn't have
a go() method.

I tried passing pop[i] to the function, so it would know that pop[i] was
a boat, but that didn't work either.  (same error)

pop, the list of boats, is global.  I put a global statement in the
function.

I'm using Python 2.2 with Windows 98.

Thanks

z