Re: test assignmet problem
Paolo Pantaleo wrote:
(snip)
Thnx for the help,
actually the problme is not solved
i have [well I want to do...] something like:
if a=b():
do stuff with a
else if a=c():
do stuff with b
where does this 'b' come from ?
else:
do other stuff
well, two solutions are
a1=b()
a2=c()
if a1:
do stuff with a1
else if a2:
do stuff with a2
else:
do other stuff
if the call to b() returns a non-false value, the call to c() is useless.
the other is
if b():
a=b()
do stuff with a
else if c():
a=c()
do stuff with b
else:
do other stuff
You still have useless function calls.
Even if none is exactly the same about:
* the number of times the b() and c() functions are executed
* the final value of a
I think the right one is:
a=b()
if a:
do stuff with a
else:
a=c()
if a=c():
do stuff with b
else:
do other stuff
Almost :
a = b()
if a:
do_stuff_with_b(a)
else:
a = c()
if a:
do_stuff_with_c(a)
else:
do_other_stuff()
Now there are probably better ways to write this, but this would require
more knowledge about your real code.
--
bruno desthuilliers
python -c print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in '[EMAIL PROTECTED]'.split('@')])
--
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Re: test assignmet problem
bruno at modulix wrote: Almost : a = b() if a: do_stuff_with_b(a) else: a = c() if a: do_stuff_with_c(a) else: do_other_stuff() Now there are probably better ways to write this, but this would require more knowledge about your real code. if there are more than a couple of options you can generalise code such as this to use a for loop: for guard, action in [ (b, do_stuff_with_b), (c, do_stuff_with_c), ]: if guard(): action(a) break else: do_other_stuff() -- http://mail.python.org/mailman/listinfo/python-list
Re: test assignmet problem
2006/4/23, Paul McGuire [EMAIL PROTECTED]: Paolo Pantaleo [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] So I tried this if(not (attr=global_re.match(line)) ): break it says invalid syntax [on the =] ... because this syntax is not valid ... so it is not possible to do test and assignment in C style? ... no it's not, see http://www.python.org/doc/faq/general/#why-can-t-i-use-an-assignment-in-an-expression how can I write this otherwise? ... is this so bad?... attr=global_re.match(line) if not attr: break ... or, since you don't seem to be doing much with attr, you could just do if not global_re.match(line): break ... and get rid of all those distracting ()'s! -- http://mail.python.org/mailman/listinfo/python-list Thnx for the help, actually the problme is not solved i have [well I want to do...] something like: if a=b(): do stuff with a else if a=c(): do stuff with b else: do other stuff well, two solutions are a1=b() a2=c() if a1: do stuff with a1 else if a2: do stuff with a2 else: do other stuff the other is if b(): a=b() do stuff with a else if c(): a=c() do stuff with b else: do other stuff Even if none is exactly the same about: * the number of times the b() and c() functions are executed * the final value of a I think the right one is: a=b() if a: do stuff with a else: a=c() if a=c(): do stuff with b else: do other stuff PAolo -- if you have a minute to spend please visit my photogrphy site: http://mypic.co.nr -- http://mail.python.org/mailman/listinfo/python-list
test assignmet problem
So I tried this if(not (attr=global_re.match(line)) ): break it says invalid syntax [on the =] so it is not possible to do test and assignment in C style? how can I write this otherwise? Thnx PAolo -- if you have a minute to spend please visit my photogrphy site: http://mypic.co.nr -- http://mail.python.org/mailman/listinfo/python-list
Re: test assignmet problem
Paolo Pantaleo wrote: So I tried this if(not (attr=global_re.match(line)) ): break it says invalid syntax [on the =] so it is not possible to do test and assignment in C style? how can I write this otherwise? With fewer parentheses for a start, but all you have to do here is to do the assignment and the test on separate lines: attr = global_re.match(line) if not attr: break In other cases you may have to work a bit harder to restructure your code. -- http://mail.python.org/mailman/listinfo/python-list
Re: test assignmet problem
Paolo Pantaleo [EMAIL PROTECTED] wrote in message news:[EMAIL PROTECTED] So I tried this if(not (attr=global_re.match(line)) ): break it says invalid syntax [on the =] ... because this syntax is not valid ... so it is not possible to do test and assignment in C style? ... no it's not, see http://www.python.org/doc/faq/general/#why-can-t-i-use-an-assignment-in-an-expression how can I write this otherwise? ... is this so bad?... attr=global_re.match(line) if not attr: break ... or, since you don't seem to be doing much with attr, you could just do if not global_re.match(line): break ... and get rid of all those distracting ()'s! -- http://mail.python.org/mailman/listinfo/python-list
