Dave Jones waveform80

opencv-python build scripts

This is all extremely hacky so you'll probably need to play around with it to get it working. On a fresh Raspbian Jessie or Raspbian Stretch install, add all the build-deps we usually have on a piwheels build slave (see https://github.com/bennuttall/piwheels/blob/master/deploy_slave.sh and install all the -dev stuff and python libs, basically). Next, add a 1Gb swap file.

In the default "pi" user, make a "packaging" directory and stuff opencv-python-build and opencv-setup.py under there. Make opencv-python-build executable and edit the for-loops

Blueberry Muffins

Makes 12

Ingredients

Shadow.py

This is a rough'n'ready experiment to see if it's feasible to detect shadowed modules on import. A shadowed module is one where a user has inadvertently named a module the same as a module on the standard search path (a common example in education is "turtle.py" and my own unfortunately named "picamera.py" :).

If this module is imported, it tweaks the standard import machinery to check for such shadowing the first time a module is imported. If it finds any, it raises ShadowWarning (which descends from ImportWarning) giving the path of the imported module, and the path of the first module

Relies upon PIL to parse the initial JPEG structure and then does its own TIFF/Exif parsing because PIL's isn't up to dealing with the "full" Exif structure; looks like it gives up after IFD0.

Only tested with the V1 camera module, but I expect it'll work with either model. There's lots of stuff in here which isn't as efficient as it could be and a fair bit of cruft, but it's only a demo :)

Multi-paradigm programming with GPIO Zero

Like Python itself, GPIO Zero is an API with multiple programming paradigms. Users can begin with a simple approach, and have the opportunity to expand into using more advanced techniques to achieve more.

	#!/usr/bin/python3
	import pygame
	from picamera import PiCamera
	from pygame.locals import *
	from sense_hat import SenseHat
	from time import sleep
	import sys
	sys.path.append("..")
	from mcp_utils import McpUtils
	from norad import get_tle

	import re
	from turtle import *

	compass = {'r': 'd', 'd': 'l', 'l': 'u', 'u': 'r'}
	angle = lambda a, b, r=0: r if a == b else angle(compass[a], b, r + 90)
	letters = {
	'H': 'u50d25r25u25d50',
	'd': 'u25r25u25d50l25R25',
	'e': 'u25r25d12l25D13r25',
	'l': 'u50D50',

	import re
	from turtle import *

	compass = {'r': 'd', 'd': 'l', 'l': 'u', 'u': 'r'}
	angle = lambda a, b, r=0: r if a == b else angle(compass[a], b, r + 90)
	cmds = (
	'd50u25r25u25d50R35l25u25r25d12l25R35D13u50R10d50R10u25r25d25l25R55'
	'U50d50r15u25d25r15u50R10D25d25r25u25l25R35d25u25r25R10U25d50R35U25l25d25r25u50'
	)
	p = re.split(r'(\d+)', cmds)

	# WARNING: This probably won't work with current versions of the
	# mmalobj layer; it was made while the layer was still being
	# developed.

	import io
	import curses
	import datetime as dt
	from picamera import array, mmal, mmalobj as mo, PiCameraMMALError
	from threading import Thread, Lock
	from PIL import Image, ImageDraw, ImageFont

	from picamera import PiCamera
	from sense_hat import SenseHat
	from PIL import Image
	from signal import pause

	class DisplayOutput():
	def __init__(self):
	self.hat = SenseHat()

	def write(self, buf):