On 17 Mar 2006 12:15:28 -0800
"Byte" <[EMAIL PROTECTED]> wrote:
> Probably a stupid question, but I'm a newbie and this
> really pisses me off. Run this script:
>
> import random
>
> def Func1():
> choice = ('A', 'B', 'C')
> output = random.choice(choice)
>
> def Func2():
> print output
>
> Func1()
> Func2()
Several possible solutions. The simplest (but least
informative):
"""
import random
def Func1():
global output
choice = ('A', 'B', 'C')
output = random.choice(choice)
def Func2():
print output
Func1()
Func2()
"""
i.e. make output a global variable
But as has already been pointed out, you aren't really using
the nature of functions here. Better:
"""
import random
def Func1():
return random.choice(('A', 'B', 'C'))
def Func2(output):
print output
Func2(Func1())
"""
You later ask about returning multiple values. Python is
pretty cool in this respect -- you can return multiple
values in a tuple, which can then be "unpacked"
automatically. This gives you a nice many-to-many idiom for
function calls, e.g.:
x, y = random_point(x_min, x_max, y_min, y_max)
And if you need to pass that to a function which takes two
arguments (x,y), you can:
set_point(*random_point(x_min, x_max, y_min, y_max))
Of course, some people would rather see that expanded out,
and indeed, too many nested function calls can be hard on
the eyes, so you might want to do this anyway:
x, y = random_point(x_min, x_max, y_min, y_max)
set_point(x, y)
or
P = random_point(x_min, x_max, y_min, y_max)
set_point(P)
and of course, it's possible that the function requires the
arguments in a different order, e.g.:
x, y = random_point(1,80,1,25)
set_rowcol(y, x, 'A')
or some such thing.
By far the coolest thing about tuple-unpacking, though, is
that this works like you'd expect it to:
x, y = y, x
instead of being a dumb mistake like this is:
x = y
y = x
which of course should be
temp = y
x = y
y = temp
But ewww that's ugly.
Cheers,
Terry
--
Terry Hancock ([EMAIL PROTECTED])
Anansi Spaceworks http://www.AnansiSpaceworks.com
--
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