Re: Importing an output from another function
Byte wrote:
Now what do I do if Func1() has multiple outputs and Func2() requires
them all to give its own output, as follows:
import random
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output
return output2
def Func2(item1, item2):
print item1, item2
output1 = Func1()
Func2(output1)
Some more options (untested):
def func1(n, choice=('A', 'B', 'C')):
# n=number of choices
# choice can now be overridden with
# other values
choices = []
for i in range(n):
choices.append(random.choice(choice))
return choices
def func2(choices):
for choice in choices:
print choice,
print
func2(func1(2))
#
class ChoosePrinter(object):
def __init__(self, to_choose_from=('A', 'B', 'C')):
self.to_choose_from=to_choose_from
self.choosen = []
def get_choices(self, n=2):
for i in range(n):
self.choosen.append(random.choice(choice))
def dump_choosen(self):
print .join(self.choosen)
self.choosen = []
cp = ChoosePrinter()
cp.get_choices(2)
cp.dump_choosen()
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Re: Importing an output from another function
Try this (I think its called argument expansion, but I really don't
know what its called, so I can't point you to docs):
This works, thanks. But how acn I get rid of the ugly surrounding
brackets and commas?
e.g. If the scripts overall output was (('B', 'C'),), how to change it
to just B C?
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Re: Importing an output from another function
Byte wrote:
Try this (I think its called argument expansion, but I really don't
know what its called, so I can't point you to docs):
This works, thanks. But how acn I get rid of the ugly surrounding
brackets and commas?
e.g. If the scripts overall output was (('B', 'C'),), how to change it
to just B C?
You can get rid of the outer parentheses by removing the asterisk from
the parameter list. But the other parentheses: ('B', 'C') will remain,
because it's a tuple. You can access the values by indexing.
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Importing an output from another function
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()
And: an error message.. It says:
Traceback (most recent call last):
File ptls-demo.py, line 11, in ?
Func2()
File how -the-hell-do-i-fix-this.py, line 8, in Func2
print output
NameError: global name 'output' is not defined
Obviosly, I need to import the variable 'output' from Func1() into
Func2(), but how?
Thanks in advance,
-- /usr/bin/byte
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Re: Importing an output from another function
Generally, a name defined into a function can't be read outside of it,
so you have to return the function result explicitely:
import random
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
return output
def Func2(item):
print item
output1 = Func1()
Func2(output1)
Bye,
bearophile
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Re: Importing an output from another function
Great, thanks -- /usr/bin/byte -- http://mail.python.org/mailman/listinfo/python-list
Re: Importing an output from another function
Now what do I do if Func1() has multiple outputs and Func2() requires
them all to give its own output, as follows:
import random
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output
return output2
def Func2(item1, item2):
print item1, item2
output1 = Func1()
Func2(output1)
Thanks in advance,
-- /usr/bin/byte
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Re: Importing an output from another function
Byte wrote:
Now what do I do if Func1() has multiple outputs and Func2() requires
them all to give its own output, as follows:
import random
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output
return output2
The function will return at return output, so return output2 will
never be reached.
def Func2(item1, item2):
print item1, item2
output1 = Func1()
Func2(output1)
Thanks in advance,
-- /usr/bin/byte
Try this (I think its called argument expansion, but I really don't
know what its called, so I can't point you to docs):
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output, output2
def Func2(*items):
print items
output = Func1()
Func2(*output1)
BETTER:
===
You can also make a generator (which I have made generalized, which
seems to be what you are striving for):
def Gener1(num):
choice = ('A', 'B', 'C')
for i in xrange(num):
yield random.choice(choice)
def Func2(item):
print item
for item in Gener1(2):
Func2(item)
James
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UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095
http://www.jamesstroud.com/
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Re: Importing an output from another function
James Stroud wrote:
Try this (I think its called argument expansion, but I really don't
know what its called, so I can't point you to docs):
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output, output2
def Func2(*items):
print items
output = Func1()
Func2(*output1)
I was wondering about '*items' when I wrote my response. I left out the
asterisk in my version and it still seems to work. Is it necessary?
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Re: Importing an output from another function
John Salerno wrote:
James Stroud wrote:
Try this (I think its called argument expansion, but I really don't
know what its called, so I can't point you to docs):
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output, output2
def Func2(*items):
print items
output = Func1()
Func2(*output1)
I was wondering about '*items' when I wrote my response. I left out the
asterisk in my version and it still seems to work. Is it necessary?
Yours is better, after I wrote mine, I realized the asterisk was
unnecessary for this particular example, except that it makes Func2 more
general.
James
--
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UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095
http://www.jamesstroud.com/
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Re: Importing an output from another function
James Stroud wrote: Yours is better, after I wrote mine, I realized the asterisk was unnecessary for this particular example, except that it makes Func2 more general. Yeah, I tested it. Func2 prints a tuple of a tuple when the asterisk is used. But your generator still wins. :) -- http://mail.python.org/mailman/listinfo/python-list
Re: Importing an output from another function
John Salerno wrote:
James Stroud wrote:
Try this (I think its called argument expansion, but I really
don't
know what its called, so I can't point you to docs):
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output, output2
def Func2(*items):
print items
output = Func1()
Func2(*output1)
I was wondering about '*items' when I wrote my response. I left out
the
asterisk in my version and it still seems to work. Is it necessary?
Yours is better, after I wrote mine, I realized the asterisk was
unnecessary for this particular example, except that it makes Func2
more
general.
James
--
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095
http://www.jamesstroud.com/
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Re: Importing an output from another function
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
--
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Anansi Spaceworks http://www.AnansiSpaceworks.com
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Re: Importing an output from another function
Byte [EMAIL PROTECTED] writes:
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()
You could declare output to be global, but it's kind of poor style.
Preferable is something like:
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
return output
def Func2(x):
print x
output = Func1() # this output is not the same as the one in Func1
Func2(output)
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Re: Importing an output from another function
James Stroud wrote:
Try this (I think its called argument expansion, but I really don't
know what its called, so I can't point you to docs):
def Func1():
choice = ('A', 'B', 'C')
output = random.choice(choice)
output2 = random.choice(choice)
return output, output2
def Func2(*items):
print items
output = Func1()
Func2(*output1)
Single asterisk == arbitrary argument list. Useful in certain
patterns, but not something you use every day.
Documentation is in the tutorial:
http://www.python.org/doc/current/tut/node6.html#SECTION00673
PS: Like self for class instance methods, *args is the
conventional name of the arbitrary argument list.
--Ben
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