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Possible Duplicate:
Short Description of Python Scoping Rules

I wrote two simple functions:

# coding: utf-8
def test():
 var = 1 
 def print_var():
 print var 
 print_var()
 print var 
 
test()
# 1
# 1
def test1():
 var = 2 
 def print_var():
 print var 
 var = 3 
 print_var()
 print var 
 
test1()
# raise Exception

In comparison, test1() assigns value after print var, then raise an Exception: UnboundLocalError: local variable 'var' referenced before assignment, I think the moment I call inner print var, var has a value of 2, am I wrong?