[Python-Dev] decorator support (original) (raw)

"Martin v. Löwis" martin at v.loewis.de
Sun Sep 5 11:16:45 CEST 2004

Raymond Hettinger wrote:

So, it would be nice if there were some support for carrying forward the argspec to inform help(), calltips(), and inspect().

What were you thinking of? I could imagine a predefined class, such as

class copyfuncattrs: def init(self, f): self.f = f

 def __call__(self, func):
     res = self.f(func)
     res.__name__ = func.__name__
     res.__doc__ = func.__doc__
     res.__dict__.update(func.__dict__)
     return res

This could be used to define a decorator

@copyfuncattrs def trace(f): def do_trace(*args): print "invoking", f.name, args return f(*args) return do_trace

which in turn could be used to decorate a function

@trace def hello(): "Print a nice greeting" print "Hello, world"

which in turn could be called and inspected

hello() print hello.doc

Then, the question is where copyfuncattrs should live, and I would object that to be yet another builtin.

Regards, Martin

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