Name: Anonymous 2012-03-09 14:32
Problem?
>>> def f(n):
... if(n==1 or n==2):
... return 1
... else:
... return f(n-1)+F(n-2)
...
>>> f(1)
1
>>> f(2)
1
>>> f(3)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "<stdin>", line 5, in f
NameError: global name 'F' is not defined
>>>