[Python-Dev] PEP 340 -- Clayton's keyword?

[Jeff Bone]

+1

This is awesome.

BTW, did we totally abandon the question of using block: as RHS?

jb

On May 5, 2005, at 12:12 AM, Greg Ewing wrote:

> How about user-defined keywords?
>
> Suppose you could write
>
>    statement opening
>
>    def opening(path, mode):
>      f = open(path, mode)
>      try:
>        yield
>      finally:
>        close(f)
>
> which would then allow
>
>    opening "myfile", "w" as f:
>      do_something_with(f)
>
> The 'statement' statement declares to the parser that an
> identifier is to be treated as a keyword introducing a
> block statement when it appears as the first token in a
> statement.
>
> This would allow keywordless block-statements that look
> very similar to built-in statements, without any danger of
> forgetting to make a function call, since a call would
> be implicit in all such block-statements.
>
> A 'statement' declaration would be needed in all modules
> which use the generator, e.g.
>
>    statement opening
>    from filestuff import opening
>
> For convenience, this could be abbreviated to
>
>    from filestuff import statement opening
>
> There could also be an abbreviation
>
>    def statement opening(...):
>      ...
>
> for when you're defining and using it in the same module.
>
> Sufficiently smart editors would understand the 'statement'
> declarations and highlight accordingly, making these
> user-defined statements look even more like the native
> ones.
>
> --  
> Greg Ewing, Computer Science Dept,  
> +--------------------------------------+
> University of Canterbury,       | A citizen of NewZealandCorp,  
> a      |
> Christchurch, New Zealand       | wholly-owned subsidiary of USA  
> Inc.  |
> greg.ewing at canterbury.ac.nz        
> +--------------------------------------+
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