Paul Rubin <http://[EMAIL PROTECTED]> wrote:
> [EMAIL PROTECTED] (Alex Martelli) writes: > > > exec? > > option 1: that just runs the compiler a bit later ... > > Besides exec, there's also locals(), i.e. > locals['x'] = 5 > can shadow a variable. Any bad results are probably deserved ;) >>> locals['x']=5 Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'builtin_function_or_method' object does not support item assignment I suspect you want to index the results of calling locals(), rather than the builtin function itself. However: >>> def f(): ... locals()['x'] = 5 ... return x ... >>> f() Traceback (most recent call last): File "<stdin>", line 1, in <module> File "<stdin>", line 3, in f NameError: global name 'x' is not defined No "shadowing", as you see: the compiler knows that x is NOT local, because it's not assigned to (the indexing of locals() does not count: the compiler's not expected to detect that), so it's going to look it up as a global variable (and not find it in this case). I think that ideally there should be a runtime error when assigning an item of locals() with a key that's not a local variable name (possibly excepting functions containing exec, which are kind of screwy anyway). Alex -- http://mail.python.org/mailman/listinfo/python-list
