bennuttall

Installing some pip packages globally, on a Raspberry Pi that's netbooted. Its root filesystem is on an NFS share.

root@piwheels20:# pip3 install pypandoc versioneer kervi scikit-build cython

Packages are collected and prepared for installation, and then it errors while trying to uninstall the system-installed cryptography:

...

bennuttall

from gpiozero import LEDBoard, Motor

class ExplorerHat:
    def __init__(self, pwm=False):
        self.leds = LEDBoard(blue=4, yellow=17, red=27, green=5,
                             _order=('blue', 'yellow', 'red', 'green'),
                             pwm=pwm
                    )
        self.motor_1 = Motor(forward=20, backward=19)
        self.motor_2 = Motor(forward=26, backward=21)

bennuttall

import sys

def foo(n):
    n = int(n)
    for i in range(n):
        print(i + 1)

if len(sys.argv) > 1:
    foo(sys.argv[1])
else:

bennuttall

word chain challenge

Given a wordlist (say, the English dictionary), if you can remove a letter from a word and the new word is a known word (in the wordlist), this makes a chain of length 2. If you can repeat this for a second time, you continue to the third level, and so on.

For example, the word "trees" has a chain length of 3:

Using the system dictionary (code snippet provided), how long is the longest chain? And which words make the longest chain?

bennuttall

from tree import Tree
from colorzero import Color

tree = Tree(25, mosi_pin=12, clock_pin=25)

while True:
    try:
        txt = input('Enter a colour name: ')
        c = Color(txt)
        print(c)

bennuttall

import operator
from graphviz import Digraph

alphabet = 'qwertyuiopasdfghjklzxcvbnm'

with open('/usr/share/dict/british-english') as f:
    WORDS = {
        word.strip()
        for word in f
        if all(c in alphabet for c in word.strip())

bennuttall

import warnings

class MyWarning(Warning):
    pass

warnings.warn(
    'this '
    'is '
    'a '
    'warning',

bennuttall

from gpiozero import Button
from gpiozero.tools import all_values, any_values

class MyButton(Button):
    def __and__(self, other):
        return all_values(self, other)
    
    def __or__(self, other):
        return any_values(self, other)
    

bennuttall

from github import Github
from time import sleep

token = ''  # enter your github access token

def is_language(path):
    # a function to determine whether or not a path from a git tree is a language folder
    # must be a "tree" (a folder) rather than a file
    # must be 5 characters long with a hyphen in the middle e.g. "fr-CA"
    return item.type == 'tree' and len(path) == 5 and path[2] == '-'

bennuttall

# this is the old version, only use if you have issues with the short version

mkdir wheels
cd wheels
wget https://bennuttall.com/files/37wheels/Keras_Applications-1.0.8-py3-none-any.whl
wget https://bennuttall.com/files/37wheels/Keras_Preprocessing-1.1.0-py2.py3-none-any.whl
wget https://bennuttall.com/files/37wheels/Markdown-3.1.1-py2.py3-none-any.whl
wget https://bennuttall.com/files/37wheels/Werkzeug-0.15.4-py2.py3-none-any.whl
wget https://bennuttall.com/files/37wheels/absl_py-0.7.1-cp37-none-any.whl
wget https://bennuttall.com/files/37wheels/astor-0.8.0-py2.py3-none-any.whl