test if PyObject * points to real python object

Jeff Epler jepler at unpythonic.net
Wed Jun 23 23:09:46 CEST 2004

On Sat, Jun 19, 2004 at 03:11:32PM +1200, David McNab wrote:
> Hi,
> With the Python/C API, how do i test if a given PyObject * actually 
> points to a real/valid python object?

In most places in the API, it's illegal for a PyObject* to point to
something other than a real/valid Python object, except that sometimes
NULL is allowed instead.  With proper refcounting, it's impossible for a
valid pointer to become invalid.

So, really, the way you tell is by the absence of a "signal 11" or
unexpected results.

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