An optional pointer to the instance print function.

The print function is only called when the instance is printed to a *real* file;

when it is printed to a pseudo-file (like a :class:`io.StringIO` instance), the

instance's :c:member:`~PyTypeObject.tp_repr` or :c:member:`~PyTypeObject.tp_str` function is called to convert it to

a string. These are also called when the type's :c:member:`~PyTypeObject.tp_print` field is

*NULL*. A type should never implement :c:member:`~PyTypeObject.tp_print` in a way that produces

different output than :c:member:`~PyTypeObject.tp_repr` or :c:member:`~PyTypeObject.tp_str` would.

The print function is called with the same signature as :c:func:`PyObject_Print`:

``int tp_print(PyObject *self, FILE *file, int flags)``. The *self* argument is

the instance to be printed. The *file* argument is the stdio file to which it

is to be printed. The *flags* argument is composed of flag bits. The only flag

bit currently defined is :const:`Py_PRINT_RAW`. When the :const:`Py_PRINT_RAW`

flag bit is set, the instance should be printed the same way as :c:member:`~PyTypeObject.tp_str`

would format it; when the :const:`Py_PRINT_RAW` flag bit is clear, the instance

should be printed the same way as :c:member:`~PyTypeObject.tp_repr` would format it. It should

return ``-1`` and set an exception condition when an error occurs.

It is possible that the :c:member:`~PyTypeObject.tp_print` field will be deprecated. In any case,

it is recommended not to define :c:member:`~PyTypeObject.tp_print`, but instead to rely on

:c:member:`~PyTypeObject.tp_repr` and :c:member:`~PyTypeObject.tp_str` for printing.

This field is inherited by subtypes.