maartenbreddels

maartenbreddels

# $ panel serve reacton-in-panel.py
import panel as pn
import reacton
import reacton.ipywidgets as w


@reacton.component
def ButtonClick(label="Hi"):
    clicks, set_clicks = reacton.use_state(0)
    def increment():

maartenbreddels

#include <Python.h>
#include <math.h>
#include <stdexcept>
#include <cstdio>
#include <numpy/arrayobject.h>


template<typename T>
void object_to_numpy1d_nocopy(T* &ptr, PyObject* obj, long long  &count, int& stride=stride_default, int type=NPY_DOUBLE) {
		if(obj == NULL)

maartenbreddels

maartenbreddels

maartenbreddels

# Makefile for converting the CSV files from http://cdn.gea.esac.esa.int/Gaia/gdr2/gaia_source/csv/
# to a single (vaex) hdf5 file
#  * https://docs.vaex.io
#  * https://github.com/maartenbreddels/vaex/
# It is multistage to work around opening 60 000 files at once.
# Strategy is
#  * stage1: convert all cvs.gz to csv to hdf5
#   * do this via xargs and calling make again, since gmake has trouble matching 60 000 rules
#  * stage2: Create part-<NUMBER>.txt files containing max FILES_PER_PART per file  
#  * stage3: convert the list of hdf5 files to single hdf5 files (part-<NUMBER>.hdf5)

maartenbreddels

maartenbreddels

import threading
from IPython.display import display
import ipywidgets as widgets
import time
def get_ioloop():
    import IPython, zmq
    ipython = IPython.get_ipython()
    if ipython and hasattr(ipython, 'kernel'):
        return zmq.eventloop.ioloop.IOLoop.instance()
ioloop = get_ioloop()

maartenbreddels

__author__ = 'breddels'
"""
Demonstrates combining Qt and tornado, both which want to have their own event loop.
The solution is to run tornado in a thread, the issue is that callbacks will then also be executed in this thread, and Qt doesn't like that.
To fix this, I show how to use execute the callback in the main thread, using a Qt signal/event in combination with Promises.

The output of the program is:
fetch page, we are in thread <_MainThread(MainThread, started 47200787479520)>
response is 191548 bytes, we are in thread <Thread(Thread-1, started daemon 47201018689280)>
the other thread should fulfil the result to this promise, we are in thread <Thread(Thread-1, started daemon 47201018689280)>

maartenbreddels