--- Stargaming <stargaming@gmail.com> wrote:
That's a harder one, indeed. Perhaps, nothing should be dereferenced (at ``compile'' time, don't know if that's a valid term in CPython's interpreter chain tho), as it is in a lambda-expression.
Just tried a few examples, almost everything interesting happens at runtime: ======== PYTHON 2.3 Valid Python: salary = 2 print (lambda: salary)() # prints 2 --- Valid, but useless, Python (no errors) lambda: salary --- Run-time error: x = lambda: salary x() NameError: global name 'salary' is not defined --- Run-time error: x = lambda: convert_to_euros(salary) x() NameError: global name 'convert_to_euros' is not defined --- Run-time error: def convert_to_euros(amt): return amt.impossible salary = None x = lambda: convert_to_euros(salary) x() AttributeError: 'NoneType' object has no attribute 'impossible' --- Run-time error: def convert_to_euros(amt): raise 'this does not get here' row = None x = lambda row: convert_to_euros(row['salary']) x(row) TypeError: 'NoneType' object is unsubscriptable ======= THEORETICAL Valid Python: row = {'salary': 50000} def convert_to_euros(amt): return amt / 2 x = rowexpr: convert_to_euros(salary) print x(row) # prints 25000 --- Run-time error: def convert_to_euros(amt): raise 'this does not get here' row = None x = rowexpr: convert_to_euros(salary) x(row) TypeError: 'NoneType' object is unsubscriptable --- ____________________________________________________________________________________ Park yourself in front of a world of choices in alternative vehicles. Visit the Yahoo! Auto Green Center. http://autos.yahoo.com/green_center/