module variable scope

[Stefan Quandt]

I want to set a modules global variable from outside like this:

<begin a.py>
v = None

def setv( x ):    v = x
def getv():    return v
<end a.py>

<begin b.py>
from a import v, setv, getv

print v
setv( 'hello' )
print print getv()
<end b.py>


Running b.py gives:
None
None

I expected variable v to be changed by calling setv() but it is not.
Who can explain this?

Thanks
  Stefan