D extensions to python, inline in an ipython/jupyter notebook

[Laeeth Isharc via Digitalmars-d-announce]

>> It would be v helpful to have a Datetime conversion from D.  
>> Looks like there is a macro for converting from ymd in 
>> datetime.h, so I guess one could just write some code against 
>> this API in C, D, or Cython and link it in with D so one can 
>> transfer data structures over more easily.
>
> I know just enough about that topic to be very scared.

I should be able to call these from D without changing PyD, I 
think, for D to Python.  Not sure about Python to D, but maybe.

https://github.com/ariovistus/pyd/blob/master/infrastructure/python/python.d

 From D to Python datetime.datetime
===================================
PyObject *PyDate_FromDate()(int year, int month, int day) {
   return PyDateTimeAPI.Date_FromDate(year, month, day, 
PyDateTimeAPI.DateType);
}
PyObject *PyDateTime_FromDateAndTime()(int year, int month, int 
day, int hour, int min, int sec, int usec) {
   return PyDateTimeAPI.DateTime_FromDateAndTime(year, month, day, 
hour,
     min, sec, usec, Py_None, PyDateTimeAPI.DateTimeType);
}

 From Python datetime.datetime to D
===================================
// D translations of C macros:
int PyDateTime_GET_YEAR()(PyObject *o) {
   PyDateTime_Date *ot = cast(PyDateTime_Date *) o;
   return (ot.data[0] << 8) | ot.data[1];
}
int PyDateTime_GET_MONTH()(PyObject *o) {
   PyDateTime_Date *ot = cast(PyDateTime_Date *) o;
   return ot.data[2];
}
int PyDateTime_GET_DAY()(PyObject *o) {
   PyDateTime_Date *ot = cast(PyDateTime_Date *) o;
   return ot.data[3];
}

int PyDateTime_DATE_GET_HOUR()(PyObject *o) {
   PyDateTime_DateTime *ot = cast(PyDateTime_DateTime *) o;
   return ot.data[4];
}
int PyDateTime_DATE_GET_MINUTE()(PyObject *o) {
   PyDateTime_DateTime *ot = cast(PyDateTime_DateTime *) o;
   return ot.data[5];
}
int PyDateTime_DATE_GET_SECOND()(PyObject *o) {
   PyDateTime_DateTime *ot = cast(PyDateTime_DateTime *) o;
   return ot.data[6];
}
int PyDateTime_DATE_GET_MICROSECOND()(PyObject *o) {
   PyDateTime_DateTime *ot = cast(PyDateTime_DateTime *) o;
   return (ot.data[7] << 16) | (ot.data[8] << 8) | ot.data[9];
}