control structures (was "Re: Sins")

[Vadim Chugunov]

skaller <skaller at maxtal.com.au> wrote in message
news:387890F6.2D1136F8 at maxtal.com.au...
> Darrell wrote:
> >
> > From: "skaller" <skaller at maxtal.com.au>
>> ...
> > def one(arg):
> >     print 'ARGV:', arg,
> >     return 'RetVal'
> >
> > def two(arg):
> >     print 'ARGV:', arg,
> >     return 'RetVal'
> >
> > states={1:one, 2:two, 3:3}
> >
> > def switch(state, args, stateTable, default=None):
> >     val=stateTable.get(state,default)
> >     if callable(val):
> >         return val(args)
> >     return val
>
> Yes, that provides the required functionality, but has a serious
> problem: cases have to be defined 'out of line', and therefore
> do not have access to the current scope.
>
> So I'm looking for a syntax for providing the above
> functionality _inline_.

Well, you could do this:

states= {
    1: compile("x=x+1","<string>","single"),
    2: compile("x=x+2","<string>","single")
}
# and later...
x = 0
exec states[y]  # executes in locals AND modifies the calling context
print x


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