Chris Angelico wrote:
On Fri, Jun 17, 2011 at 10:48 AM, Steven D'Aprano
<steve+comp.lang.pyt...@pearwood.info> wrote:
Perhaps the most sensible alternative is conditional importing:
# === module extras.py ===
def ham(): pass
def cheese(): pass
def salad(): pass
# === module other.py ===
def spam(): pass
if not some_condition: from extras import *
This would, if I understand imports correctly, have ham() operate in
one namespace and spam() in another. Depending on what's being done,
that could be quite harmless, or it could be annoying (no sharing
module-level constants, etc).
No, he's using `from ... import *`. It dumps it all in the same
namespace (which is usually why it's frowned upon, but in his example
it's kind of the point).
I don't see it as a very compelling solution beyond putting code using a
simple `if`. And it's still rather hard to imagine a serious use case.
As to which keyword is used, I would be inclined to go with 'return'
rather than 'break'. The module is thus a procedure in its own right.
Of course, that's assuming the feature's actually needed, which isn't
certain by any means.
Neither makes sense. `break` exits out of looping structures, which the
top-level code of a module most certainly is not. `return` returns out
of functions or methods and -- most importantly -- _returns something_.
(`return` without an argument returns None). Modules have no facility
to return anything, nor would it make much sense at all to do so.
This is an example of a problem that simply does not need solving with
additional language changes: There are already perfectly good (and,
perhaps more importantly, clear) facilities to do whatever it is you
want to do. If you want to exit, call `sys.exit`. If you want to
conditionally execute some code, use `if`. If you want to indicate an
exceptional condition, raise an exception.
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