gerryjenkinslb

# See Medium Article to go along with this gist at: https://gerry-jenkins.medium.com/installing-archlinux-in-virtualbox-beats-dual-boot-for-work-eb4c5cf2fed7 or at my site: http://gjenkinsedu.com/post/2021-01-13_installing-linux-in-virtualbox-best-dual-boot-for-real-work/

# ArchForVBFormula,  

## VirtualBox Setup
   - Arch Linux 64 bit
   - Memory: 2G to recommended half of total
   - Drive: VDI dynamic at least 30G for working system
   - Processor cores: recommend half of total
   - Display: max out the amount of display memory

gerryjenkinslb

import math
import pygame

# initial setups
pygame.init()
screen_size = 500
surface = pygame.display.set_mode((screen_size, screen_size)) # window size and pixels width/height

# animation state variables
angle_per_step = .05  # degrees

gerryjenkinslb

from inspect import getframeinfo, currentframe
import os


def line_at(style=None):
    """
    returns string with caller filename function name and line number
    style parameter (sample string):
        
    'long': 'File /Home/user/xyz.py, in foo(), Line 233'

gerryjenkinslb

from collections import namedtuple

''' Linear time complete graph check for structural balance checker as per
https://www.reddit.com/r/dailyprogrammer/comments/aqwvxo/20190215_challenge_375_hard_graph_of_thrones/

Algorithm. Since it is a complete graph that has every possible edge between nodes. We don't need a graph.

As we read edges, store edge in dictionary with key as tuple of the two nodes names, 
normalized so the first node in the tuple is less than second

gerryjenkinslb

# f-strings new in 3.6 and 3.7+

# f-string tutorial code for video: https://youtu.be/c46t7eIldaI

# multiple columns how do you align decimals (zeros should fill in)
# using field width to align columns of numbers
values = [1, 3, 5, 7, 10, 21]

# table of float(v1/v2) for all combinations

gerryjenkinslb

from bs4 import BeautifulSoup
import re
import requests
import csv
import time
import json

# version 1.1 added handling of youtube.com/channel/
#  to already handling of youtube.com/user based channels

gerryjenkinslb

import inspect
""" var_dump('vars') module to dump variables (python 3.6+: uses f strings)"""


def var_dump(var_list_str):
    """ print variables in callers scope indicated in space delimited string param"""

    # retrieve information needed on callers frame
    prev_frame = inspect.currentframe().f_back
    frame_info = inspect.getframeinfo(prev_frame)

gerryjenkinslb

Python tuple detailed

A tuple is like a list - but safer, faster & smaller

A tuple is an array of object references
it is ordered, and indexed from zero
you cannot modify a tuple entry (immutable)

• Note that entries in a tuple are references to an object,
  and you can't change which object the tuple points to for a given element.

gerryjenkinslb

# uses python3 features
from time import time

# Fast solution for problem from Tomasz Nurkiewicz blog:
# https://www.nurkiewicz.com/2018/09/brute-forcing-seemingly-simple-number.html?utm_source=programmingdigest&utm_medium=email&utm_campaign=featured

# heuristic to greatly speed up from discussion of knights tour problem at
# https://runestone.academy/runestone/static/pythonds/Graphs/KnightsTourAnalysis.html

# by Gerry Jenkins see my channel youtube.com/gjenkinslbcc

gerryjenkinslb

# bst.py immutable Binary search tree (not balanced)
# using 'yield from' new in python 3.3

# start with tree = None
# nodes are a list of [value, left_tree, right_tree]
# every node is a subtree, so tree argument is a tree or subtree

def insert(tree, value):
    """ creates tree if tree is None, returns new tree"""
    if not tree: