static variables

[Ulli Horlacher]

I try to to implement a "static variable" inside a function:

def main():
  a(1)
  a(2)
  a()
  print(a.x)
  if 'a.x' in globals(): print('global variable')
  if 'a.x' in locals():  print('local variable')

def a(x=None):
  if not x is None: a.x = x
  print(':',a.x)

main()

When I run this code, I get:

: 1
: 2
: 2
2

This is exactly what I expect.
But what is a.x?
It is neither a variable in globals() nor in locals()


-- 
Ullrich Horlacher              Server und Virtualisierung
Rechenzentrum IZUS/TIK         E-Mail: horlacher at tik.uni-stuttgart.de
Universitaet Stuttgart         Tel:    ++49-711-68565868
Allmandring 30a                Fax:    ++49-711-682357
70550 Stuttgart (Germany)      WWW:    http://www.tik.uni-stuttgart.de/