C API q

[Emanuel Landeholm]

Hello!

I'm a Py neophyte trying to code an extension module in C. I would like
to know how, canonically, to remove a certain PyObject from a PyList,
from C. The solution I have come up with so far involves iterating
through the PyList keeping a counter, and then using
PyList_DelItem(counter) on the counter when the iter item == the
PyObject. But this is kind of messy. I'm sure there's a cleaner way to
do it?

TIA,
Emanuel

 

[Emanuel Landeholm]

PyList_DelItem(counter) on the counter when the iter item == the

Sorry. Make that PyObject_DelItem.

 

[Diez B. Roggisch]

Hello!

I'm a Py neophyte trying to code an extension module in C. I would like
to know how, canonically, to remove a certain PyObject from a PyList,
from C. The solution I have come up with so far involves iterating
through the PyList keeping a counter, and then using
PyList_DelItem(counter) on the counter when the iter item == the
PyObject. But this is kind of messy. I'm sure there's a cleaner way to
do it?

I doubt it - after all, the only access to a lists items is by
iterating/indexing over them, but not by id - so the remove() of a
python-list in the interpreter is only sugar over the procedure you
describe. But of cours you can write your own function and pass that a list
and an object

 

[Alex Martelli]

Hello!

I'm a Py neophyte trying to code an extension module in C. I would like
to know how, canonically, to remove a certain PyObject from a PyList,
from C. The solution I have come up with so far involves iterating
through the PyList keeping a counter, and then using
PyList_DelItem(counter) on the counter when the iter item == the
PyObject. But this is kind of messy. I'm sure there's a cleaner way to
do it?

You can call the 'remove' method on the list object from C just as you
could from Python, essentially. Internally, that does essentially the
same thing you're doing here, but it does make your own code simpler.


Alex

 

[Emanuel Landeholm]

You can call the 'remove' method on the list object from C just as you
could from Python, essentially. Internally, that does essentially the
same thing you're doing here, but it does make your own code simpler.

Okay, how do I do that?

 

[Alex Martelli]

Okay, how do I do that?

Any of several ways, such as:

PyObject_CallMethod(oblist, "remove", "O", obitem)


Alex