Simple Python class questions

Lie Lie.1296 at gmail.com
Thu Jun 19 17:15:39 CEST 2008


On Jun 19, 7:21 pm, Ulrich Eckhardt <eckha... at satorlaser.com> wrote:
> John Dann wrote:
> > Let's say I define the class in a module called comms.py. The class
> > isn't really going to inherit from any other class (except presumably
> > in the most primitive base-class sense, which is presumably automatic
> > and implicit in using the class keyword). Let's call the class
> > serial_link. So in comms.py I have:
>
> > class serial_link:
> >     def __init__(self):
> >         Try
> >             Import serial # the pyserial library
>
> Stop, this can't work. Other than VB, Python actually is case sensitive, so
> you must write 'try' and not 'Try' and also 'import' and not 'Import'.
> Further, many (all?) statements that cause an indention are usually
> terminated with a colon, so like with 'class ..:' and 'def ..:' you also
> must use 'try:' and not just 'try'. Fix all these and try again, I guess
> this will already help a lot.
>
> One more thing: you are abusing exceptions. Typically, in such a short
> program you only have one try-except pair in the main entry function and
> all other code only throws the exceptions. In particular the __init__
> function of a class should always signal errors using exceptions. However,
> this is not a strict yes/no question but rather a stylistic one.
>
> Uli
>
> --
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I think it's not that hard to see that it's just a pseudo code



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