[Python-Dev] PEP 318 trial balloon (wrappers) (original) (raw)

Phillip J. Eby pje at telecommunity.com
Fri Mar 12 10:03:36 EST 2004

At 06:50 PM 3/11/04 -0500, Jewett, Jim J wrote:

---------- class Foo: [transform] from: def x(): pass

[wrapper] from: class x: pass [decorator] from: def x(): pass x() is now defined exactly as it was before, except that it has an extra indent to the right. --------- I understand most of the objections well enough to summarize them; I'm singling these out because I'm not sure I that I do. Phillip J. Eby: > It is ambiguous precisely because it introduces a new suite. > Suites in Python indicate a difference in execution context, > often along with introducing a new namespace. This new syntax > does neither. Today, if we wait until the declaration is finished, we can write for decorator in seq: var = decorator(var) How does this construct change the context or namespace any less than a for loop?

In your proposal, the function definition is nested, but its execution context and namespace are unchanged. The presence of a suite implies that either the control flow or the namespace (or both) are affected, but your proposed syntax affects neither.

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