[Python-Dev] Declaring setters with getters (original) (raw)

Tony Lownds tony at PageDNA.com
Thu Nov 1 19:26:52 CET 2007

On Nov 1, 2007, at 10:26 AM, glyph at divmod.com wrote:

This is a minor nit, as with all decorators that take an argument, it seems like it sets up a hard-to-debug error condition if you were to accidentally forget it:

@property def foo(): ... @property.set def foo(): ... would leave you with 'foo' pointing at something that wasn't a descriptor at all. Is there a way to make that more debuggable?

How about this: give the property instance a method that changes a
property from read-only to read-write. No parens, no frame magic. As a small bonus, the setter function would
not have to be named the same as the property.

class A(object): @property def foo(self): return 1

@foo.setter def set_foo(self, value): print 'set:', value

-Tony

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