Money Global Variable

[perfringo]

Another way is to use closure 'creatively' to reference the money (not that I recommend such a practice; changing value in global namespace from within function makes debugging real pain):

>>> money = [4000]
>>> def blacksmith():
...     money[0] -= 300
...     print('you bought a sword')
... 
>>> def oldwitch():
...     money[0] -= 700
...     print('you bought a potion')
... 
>>> blacksmith()
you bought a sword
>>> money[0]
3700
>>> oldwitch()
you bought a potion
>>> money[0]
3000