Question

I am trying to figure out this:

c = 1 def f(n):     print c + n  def g(n):     c = c + n  f(1) # => 2 g(1) # => UnboundLocalError: local variable 'c' referenced before assignment 

Thanks!

Answer 1

Within a function, variables that are assigned to are treated as local variables by default. To assign to global variables, use the global statement:

def g(n):     global c     c = c + n 

This is one of the quirky areas of Python that has never really sat well with me.