Frank Millman wrote: > Paddy wrote: > > Hi, > > I am trying to work out why I get UnboundLocalError when accessing an > > int from a function where the int is at the global scope, without > > explicitly declaring it as global but not when accessing a list in > > similar circumstances. > > > > With the statement 'm = m + 1', as m is assigned to on the LHS, it is > deemed to be local, but as m does not yet have a value on the RHS, you > get Unbound Local Error. > > With the statement 'n[0] = n[0] + 1', n is not being assigned to, as it > is mutable. Therefore Python looks in the global namespace, finds n > there, and uses it successfully. > > My 2c > > Frank Millman So, to paraphrase to test my understanding:
in the statement: ' n[0] = n[0] + 1' it is the object referenced by the name n that is being assigned to rather than n itself, so n is not 'tagged' as a local variable by the LHS of the assignment. Thanks Frank. all is is now clear :-) -- http://mail.python.org/mailman/listinfo/python-list
