[Tutor] Local variable --> global variable -- how to?

[Deirdre Saoirse]

On Thu, 15 Mar 2001, Thomas Ueland Torp wrote:

> def Shipcost():
>     print 'cost:', g, 'metal'
>     print 'cost:', h, 'crystal'
>
> def Interceptor():
>     print 'Interceptors'
>     b = int(raw_input ("How many? "))
>     g = 1000*b
>     h = 0
>     Shipcost()
>
> When I run this I get this error:
> NameError: global name 'g' is not defined
>
> I do see the problem, of course. The g in Interceptor() is not global,
> only local (as I understand it). Problem is, how do I get the
> variables to become global.

1) bad idea to make variables global unless there is no other way.
2) there is nearly always another way.
3) Pass g and h to the Shipcost function:

 def Shipcost(gold, crystal):
     print 'cost:', gold, 'metal'
     print 'cost:', crystal, 'crystal'

 def Interceptor():
     print 'Interceptors'
     b = int(raw_input ("How many? "))
     g = 1000*b
     h = 0
     Shipcost(g, h)

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