[Python-ideas] Make obj[] valid syntax?

Thomas Heller theller at ctypes.org
Wed Nov 14 19:29:52 CET 2007

I'm not sure if this is a good idea or not, but - hey - this
is python.ideas ;-)

The following statements currently raise a SyntaxError:

  obj[] = something
  x = obj[]

I propose to make these statements valid syntax.
'obj[]' should behave like 'obj[()]' does:
Call __getitem__ or __setitem__ with an empty tuple.

My use case is in a COM library (comtypes).

Some COM properties require one or more arguments; this is
not a problem since one could write
  obj.prop[1, 2, 3]

Sometimes, however, arguments are optional.  Unfortunately
one has to write
to pass an empty tuple to __getitem__ or __setitem__,
which looks strange imo.



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