Python Math libraries - How to?

[delta2]

I am also using Zelle's book to teach myself programming and Python.  I also
had a problem with " import math ", but the alternative of " from math
import * "  is working for me.  I don't know why one works and the other
doesn't.


Cousin Stanley-3 wrote:
> 
> 
>>
>> Here is the arithmetic program I made that it worked before I added
>> the "import math" line.  
>>
>> #volumen.py
>> # A program to compute the volume and surface area of a sphere
>> import math
>>
>> ....
>> NameError: global name 'pi' is not defined
>> ....
> 
>>>> from math import *
>>>>
>>>> def surface( r ) :
> ...     return 4 * pi * r ** 2
> ...
>>>> def volume( r ) :
> ...     return ( 4. / 3. ) * pi * r ** 3
> ...
>>>> for n in range( 1 , 11 ) :
> ...     s = surface( n )
> ...     v = volume( n )
> ...     print '    %2d .... %9.4f .... %9.4f ' % ( n , s , v )
> ...
> 
> 
> -- 
> Stanley C. Kitching
> Human Being
> Phoenix, Arizona
> 
> --
> http://mail.python.org/mailman/listinfo/python-list
> 
> 

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