Question

this is my code :

def a():
    print aa

def b():
    aa = 'aaaa'
    a()

b()

it show error :

Traceback (most recent call last):
  File "g.py", line 12, in <module>
    b()
  File "g.py", line 10, in b
    a()
  File "g.py", line 6, in a
    print aa
NameError: global name 'aa' is not defined

the aa must be defined in the b function,

what can i do ,

thanks

Answer 1

aa is only defined in the scope of b(). You can pull the variable definition out of the function or use it as an argument.

This should work:

def a():
    print aa

def b():
    global aa
    aa = 'aaaa'
    a()

b()

This should also work, of course:

def a(aa):
    print aa

def b():
    aa = 'aaaa'
    a(aa)

b()