ten small Python programs - comp.lang.python

Message from discussion ten small Python programs

Steve Howell

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More options May 27 2007, 6:05 am

Newsgroups: comp.lang.python

From: Steve Howell <showel...@yahoo.com>

Date: Sat, 26 May 2007 13:05:02 -0700 (PDT)

Local: Sun, May 27 2007 6:05 am

Subject: Re: ten small Python programs

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--- Steven Bethard <steven.beth...@gmail.com> wrote:

> Very cool! Do you mind putting this up on the Wiki
> somewhere so that we
> can link to it more easily? Maybe something like:

> http://wiki.python.org/moin/SimplePrograms

Done.

> <nitpick>
> Though the code should probably follow PEP 8
> guidelines, e.g.
> under_scores instead of camelCase for object and
> method names:

> http://www.python.org/dev/peps/pep-0008/
> </nitpick>

I think I fixed them, please see Wiki to verify.

> > class ShoppingCart:
> > def __init__(self): self.items = []
> > def buy(self, item):
> self.items.append(item)
> > def boughtItems(self): return self.items
> > myCart = ShoppingCart()
> > myCart.buy('apple')
> > myCart.buy('banana')
> > print myCart.boughtItems()

> I think boughtItems() is probably not a good example
> of Python code
> since in this case, you should probably just write
> ``my_cart.items``.
> Maybe it should define ``__len__`` instead? Or maybe
> something like::

> def select_items(self, prefix):
> return [item for item in self.items if
> item.startswith(prefix)]

I think the problem here is that it's hard to write a
useful class in less than 10 lines of code. Can
somebody else give it a try?

Although I didn't call it out in the email, I tried to
make each program progressively one line longer, so if
somebody wants to write, say, an 11-line class
example, then I will try fill in the gap with another
8-liner.

Did I miss any basic concepts in the first 10
programs? Maybe an 8-liner could demonstrate command
line arguments?

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