Re: [Tutor] Calling a function does not return what I want it to return
On Thu, Jul 19, 2012 at 4:21 PM, Dave Angel wrote:
> On 07/19/2012 06:58 PM, Alexander Q. wrote:
> > I have this little program that is supposed to calculate how many
> diagonals
> > a polygon of x sides has, but it does not return what I have in the
> > "return" part of the function when I call it. Here is the code:
> >
> > def num_diag(var):
> > ans = 0
> > if var <= 3:
> > print("No diagonals.")
> > else:
> > for i in range(num_sides - 3):
> > ans = ans + i
> >
> > return (((var - 3)*2) + ans)
> >
> > num_sides = (int(raw_input("Enter sides: ")))
> > num_diag(num_sides)
> >
> >
> > Any suggestions as to what is going on? When I run it, it prompts me for
> > the number of sides, and that's it.
> > Thanks.
> >
> >
>
> You never use the return value. Try assigning it, and printing it.
>
> result = num_diag(num_sides)
> print("final answer=", result)
>
> --
>
> DaveA
>
> That did it- thanks Dave!
-Alex
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Re: [Tutor] Calling a function does not return what I want it to return
On 20/07/12 00:17, Prasad, Ramit wrote:
def num_diag(var):
ans = 0
if var <= 3:
print("No diagonals.")
else:
for i in range(num_sides - 3):
ans = ans + i
return (((var - 3)*2) + ans)
num_sides = (int(raw_input("Enter sides: ")))
num_diag(num_sides)
NameError: global name 'num_sides' is not defined
`for i in range(num_sides - 3):`
Change num_sides to var.
It should work without, because it will pick up the
global variable definition.
It's probably not working the way it was intended to,
but it should work... But changing it to use the
argument would definitely be better.
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
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Re: [Tutor] Calling a function does not return what I want it to return
On 07/19/2012 06:58 PM, Alexander Q. wrote:
> I have this little program that is supposed to calculate how many diagonals
> a polygon of x sides has, but it does not return what I have in the
> "return" part of the function when I call it. Here is the code:
>
> def num_diag(var):
> ans = 0
> if var <= 3:
> print("No diagonals.")
> else:
> for i in range(num_sides - 3):
> ans = ans + i
>
> return (((var - 3)*2) + ans)
>
> num_sides = (int(raw_input("Enter sides: ")))
> num_diag(num_sides)
>
>
> Any suggestions as to what is going on? When I run it, it prompts me for
> the number of sides, and that's it.
> Thanks.
>
>
You never use the return value. Try assigning it, and printing it.
result = num_diag(num_sides)
print("final answer=", result)
--
DaveA
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Re: [Tutor] Calling a function does not return what I want it to return
On 7/19/2012 3:58 PM Alexander Q. said...
I have this little program that is supposed to calculate how many
diagonals a polygon of x sides has, but it does not return what I have
in the "return" part of the function when I call it. Here is the code:
def num_diag(var):
ans = 0
if var <= 3:
print("No diagonals.")
else:
for i in range(num_sides - 3):
ans = ans + i
return (((var - 3)*2) + ans)
num_sides = (int(raw_input("Enter sides: ")))
You're almost there. Change the following
num_diag(num_sides)
to
print num_diag(num_sides)
(for pythons < v3) or
print (num_diag(num_sides))
(for python v3 >)
Then see where that takes you.
Emile
Any suggestions as to what is going on? When I run it, it prompts me for
the number of sides, and that's it.
Thanks.
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Re: [Tutor] Calling a function does not return what I want it to return
> I have this little program that is supposed to calculate how many diagonals a
> polygon of x sides has, but it does not return what I have in the "return"
> part of the function when I call it. Here is the code:
>
> def num_diag(var):
> ans = 0
> if var <= 3:
> print("No diagonals.")
> else:
> for i in range(num_sides - 3):
> ans = ans + i
>
> return (((var - 3)*2) + ans)
>
> num_sides = (int(raw_input("Enter sides: ")))
> num_diag(num_sides)
>
>>> num_diag(5)
NameError: global name 'num_sides' is not defined
`for i in range(num_sides - 3):`
Change num_sides to var.
Ramit
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[Tutor] Calling a function does not return what I want it to return
I have this little program that is supposed to calculate how many diagonals
a polygon of x sides has, but it does not return what I have in the
"return" part of the function when I call it. Here is the code:
def num_diag(var):
ans = 0
if var <= 3:
print("No diagonals.")
else:
for i in range(num_sides - 3):
ans = ans + i
return (((var - 3)*2) + ans)
num_sides = (int(raw_input("Enter sides: ")))
num_diag(num_sides)
Any suggestions as to what is going on? When I run it, it prompts me for
the number of sides, and that's it.
Thanks.
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