devdave

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

devdave

"""
this code is not mine! i shamelessly copied it from http://stackoverflow.com/questions/19790188/expanding-english-language-contractions-in-python
all credits go to alko and arturomp @ stack overflow.

basically, it's a big find/replace.
"""

import re
cList = {
  "ain't": "am not",

devdave

Python People

An incomplete list of people in the Python community to follow on Twitter and Mastodon.

With the risk that Twitter dies, I'd be sad to lose links to interesting people in the community, hence this list.

I would love you to comment below with links to people I've missed.

More context and comments at the end of the list.

devdave

#NoEnv

#Warn All
#Warn LocalSameAsGlobal, Off
#Persistent

/*
Speech Recognition
==================
A class providing access to Microsoft's SAPI. Requires the SAPI SDK.

devdave

My explanation of the main concepts in Rust

There are three main concepts with Rust:

1. Ownership (only one variable "owns" the data at one time, and the owner is in charge of deallocating)
2. Borrowing (you can borrow a reference to an owned variable)
3. Lifetimes (all data keeps track of when it will be destroyed)

These are fairly simple concepts, but they are often counter-intuitive to concepts in other languages, so I wanted to give a shot at

devdave

def get_count(q):
    count_q = q.statement.with_only_columns([func.count()]).order_by(None)
    count = q.session.execute(count_q).scalar()
    return count

q = session.query(TestModel).filter(...).order_by(...)

# Slow: SELECT COUNT(*) FROM (SELECT ... FROM TestModel WHERE ...) ...
print q.count()

devdave

This is a small demo of how to create a library in Rust and call it from Python (both CPython and PyPy) using the CFFI instead of ctypes.

Based on http://harkablog.com/calling-rust-from-c-and-python.html (dead) which used ctypes

CFFI is nice because:

• Reads C declarations (parses headers)
• Works in both CPython and PyPy (included with PyPy)
• Lower call overhead than ctypes

devdave

/*****************************************************************
 * onMessage from the extension or tab (a content script)
 *****************************************************************/
chrome.runtime.onMessage.addListener(
  function(request, sender, sendResponse) {
    if (request.cmd == "any command") {
      sendResponse({ result: "any response from background" });
    } else {
      sendResponse({ result: "error", message: `Invalid 'cmd'` });
    }

devdave

'use strict';

var express = require('express'),
    app = express(),
    http = require('http'),
    server = http.createServer(app),
    path = require('path'),
    io = require('socket.io').listen(server),
    fs = require('fs'),
    zmq  = require('zmq'),

devdave

import ctypes, sys
from ctypes import windll, wintypes
from uuid import UUID

class GUID(ctypes.Structure):   # [1]
    _fields_ = [
        ("Data1", wintypes.DWORD),
        ("Data2", wintypes.WORD),
        ("Data3", wintypes.WORD),
        ("Data4", wintypes.BYTE * 8)