Paul McGuire ptmcg

Pythonista since 2002. Author of @pyparsing , littletable, and plusminus Python packages. Coauthor of "Python in a Nutshell" 4ed

ptmcg / iter_sieve.py

Last active July 16, 2024 16:55

Sieve of Eratosthenes - using filtering iterators

	import functools
	import itertools
	from collections.abc import Iterator


	def is_multiple_of(p: int, x: int) -> bool:
	# if x % p == 0:
	# print("discarding", x, "multiple of", p)
	return x % p == 0

ptmcg / logger_handler_demo.py

Last active March 11, 2024 04:46

Demonstration of setting log level in a handler overrides setting log level in a logger

	# Demonstrates that setting the log level in a handler overrides any setting of log level in the logger
	#
	# The purpose of this is to support adding handlers that take extra action or route log messages to other
	# destinations for any logs at higher levels. For instance, creating and adding a handler to the root
	# logger where the handler's level is set to ERROR, and streams its logs to a notification service queue.
	# Even if the logger's level is set to a lower level of logging, the specialized handler only routes
	# ERROR or higher log messages to the notification service.
	#
	# The problem arises if the handler that is set to a particular log level is the root logger's sole
	# stdout handler. In this case, it becomes difficult to change the log level on the logger, because the

ptmcg / generators_of_generators.py

Last active November 29, 2023 23:36

Wrapping iterators in generators in generators in ...

	# remove pesky trailing newlines from iterating over a text file

	def denewlining(line_iterator):
	for line in line_iterator:
	yield line.rstrip("\n\r")


	with open(__file__) as infile:
	for line in denewlining(infile):
	print(f"{line!r} <-- look ma! no trailing newlines!")

ptmcg / job_state.py

Last active October 2, 2023 19:00

State pattern in Python

	import contextlib


	class InvalidStateActionError(NotImplementedError):
	pass


	class InvalidStateTransitionError(InvalidStateActionError):
	pass

ptmcg / events.md

Last active May 19, 2023 17:08

Textual Class Diagrams

Diagrams

classDiagram
    
    class Message {
        time: float
        is_forwarded: bool
        handler_name: str

ptmcg / peps.json

Created November 9, 2022 20:51

	[
	{"id": "1", "title": "PEP Purpose and Guidelines", "authors": "Warsaw, Hylton, Goodger, Coghlan", "discussions_to": null, "status": "Active", "type": "Process", "topic": "", "created": "13-Jun-2000", "python_version": null, "post_history": "21-Mar-2001, 29-Jul-2002, 03-May-2003, 05-May-2012, 07-Apr-2013", "resolution": null, "requires": null, "replaces": null, "superseded_by": null, "url": "https://peps.python.org/pep-0001/", "abstract": ""},
	{"id": "2", "title": "Procedure for Adding New Modules", "authors": "Cannon, Faassen", "discussions_to": null, "status": "Active", "type": "Process", "topic": "", "created": "07-Jul-2001", "python_version": null, "post_history": "07-Jul-2001, 09-Mar-2002", "resolution": null, "requires": null, "replaces": null, "superseded_by": null, "url": "https://peps.python.org/pep-0002/", "abstract": "\nIntroduction\nThe Python Standard Library contributes significantly to Python's\nsuccess. The language comes with \"batteries included\", so it is easy\nfor people to become produ

ptmcg / splitby.py

Last active July 26, 2022 12:11

	import typing
	from functools import lru_cache

	T = typing.TypeVar("T")
	PredicateFunction = typing.Callable[[T], bool]
	SourceIterable = typing.Iterable[T]
	ObjectList = typing.List[T]


	def splitby(

ptmcg / plusminus_dice_roller_demo.html

Created June 1, 2022 23:07

Pyscript+plusminus Dice Roller


	<html>
	<head>
	<title>Plusminus Dice Roller</title>
	<link rel="stylesheet" href="https://pyscript.net/alpha/pyscript.css" />
	<script defer src="https://pyscript.net/alpha/pyscript.js"></script>
	<py-env>
	- plusminus
	</py-env>
	</head>

ptmcg / pyscript_littletable_iris.html

Last active May 19, 2022 03:28

Demonstration of CSV import using littletable in pyscript

	<html>
	<head>
	<script defer src="https://pyscript.net/alpha/pyscript.min.js"></script>
	<py-env>
	- littletable
	</py-env>
	</head>
	<body>

	<h2>Iris data</h2>

ptmcg / pyscript_pyparsing_arith_eval.html

Last active May 19, 2022 21:36

PyScript demo of a pyparsing arithmetic parser/evaluator

	<html>
	<head>
	<script defer src="https://pyscript.net/alpha/pyscript.js"></script>
	</head>

	<body>

	<table cellpadding=30 border=2>
	<tr>
	<td>