Data sticking around too long

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    Cedric> But I'd like to understand this a bit more.

Always a good idea. ;-)

    Cedric> Here's another script:

    Cedric> class ScannerCommand:
    Cedric>     taskName = ''
    Cedric>     scanList = []

    Cedric>     def __init__(self, data):
    Cedric>         self.scanList = []
    Cedric>         self.scanList.append(data)
    ...

The assignment to self.scanList in __init__ creates an instance attribute in
the ScannerCommand instance.  The scanList attribute at the class level is
available as ScannerCommand.scanList.  In your previous code, (no assignment
to self.scanList in __init__), references to self.scanList would search
first in the instance dict for a "scanList" key, then failing to find
anything there, search the class's dict and find its "scanList" key.

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