class-call a function in a function -problem

[wierus]

 Hello, i have a problem. I write my first class in python so i'm not a 
experience user.  I want to call a function in another function, i tried to 
do it in many ways, but i always failed:(
I supposed it's sth very simple but i can't figure what it is:
==================================
class ludzik:
 x=1
 y=2
 l=0
 def l(self):
  ludzik.l=ludzik.x+ludzik.y
  print ludzik.l

 def ala(self):
  print ludzik.x
  print ludzik.y
  ludzik.l()


z=ludzik()
z.ala()
====================================


k.py
1
2
Traceback (most recent call last):
  File "k.py", line 17, in ?
    z.ala()
  File "k.py", line 14, in ala
    ludzik.l()
TypeError: unbound method l() must be called with ludzik instance as
first argument (got nothing instead)


i would be gratefull for resolving this problem for me....