[NCLUG] Dumb Python Question

[Evelyn Mitchell]

* On 2002-07-30 19:29 marciot <marciot at holly.colostate.edu> wrote:
> >===== Original Message From nclug at nclug.org =====
> >* On 2002-07-30 16:28 marciot <marciot at holly.colostate.edu> wrote:
> >> What's wrong with this line?
> >>
> >>         popupMenu = Menu(self, tearoff=0)
> >>         popupMenu.add_command(label="water", command=lambda: pass )
> >>
> >> Python whines about a syntax error right after "pass". I've tried to RTFM, 
> but
> >
> >What package is "Menu" from?
> 
> tkinter
> 
> >
> >> there is so much documentation out there I can't find one that addresses my
> >> specific problem. There is such a thing as *too* much docs...
> >
> >pydoc2 'name of package containing Menu'
> >look for 'add_command'
> 
> Actually, I think my problem relates to lambda functions, not to the Menu per 
> se. For example, at the interactive prompt, I can type:
> 
> a = lambda: sys.exit()
> 
> But not:
> 
> a = lambda: pass
> 
> I wanted a lambda function that was equivalent to:
> 
> def doNothing():
>    pass
> 
> Why doesn't python let me do that?

It looks from this:

  http://www.python.org/tim_one/000050.html

that it is because lambda is expecting an expression, not a statement.

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Evelyn Mitchell             Linux Consulting since 1995
efm at tummy.com               Senior System and Network Administrators
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