[Python-Dev] A Hygienic Macro System in Python?

2002年3月19日 17:39:40 +1200 (NZST)

Tim Peters <tim.one@comcast.net>:
> Maybe Guido can introduce a canned "withlock" macro just
> for that <ahem>:
>> withlock lock:
> do stuff

Daniel Mahler <mahler@cyc.com>:
> There are many APIs that lead you to write code with certain fixed
> parts
> ...
> I think the thing worth noting here is that the introduced
> constructs would usually be colon&indent type entities

I've been trying to think of a Pythonic syntax for passing
code blocks to procedures. The best thing I've come up with
so far is something like
 lock.do:
 something()
which would be (sort of) equivalent to
 def thunk():
 do_something()
 lock.do(thunk)
except that the thunk would have to have write access to
the namespace it's embedded in, perhaps implemented by
sharing the stack frame.
Greg Ewing, Computer Science Dept, +--------------------------------------+
University of Canterbury,	 | A citizen of NewZealandCorp, a	 |
Christchurch, New Zealand	 | wholly-owned subsidiary of USA Inc. |
greg@cosc.canterbury.ac.nz	 +--------------------------------------+