treyhunner

# fork of https://github.com/django/django/blob/b7c7209c67f742eda8184c46f139e0e1cb16a1f4/django/core/management/commands/shell.py
import os
import select
import sys
import traceback

from django.core.management import BaseCommand, CommandError
from django.utils.datastructures import OrderedSet

treyhunner

import inspect


_SENTINEL = object()


class super:

    """The built-in super "function" re-implemented."""

treyhunner

"""
Just some code that needlessly converts unicode codepoints to UTF-8.

Example:

    $ python utf8ify.py U+2728
    Bytes: 0xe2 0x9c 0xa8
    Text: ✨

    $ python utf8ify.py U+1F3F3 U+FE0F U+200D U+1F308

treyhunner

"""
Tool that names each unicode character based on their name or their aliases

Must be run from the cpython repo root directory:
https://github.com/python/cpython/tree/3.10

Relies on Tools.unicode being an importable path due to implicit packages
"""
from contextlib import redirect_stderr, redirect_stdout
from io import StringIO

treyhunner

"""
Script to print all Unicode flag emoji are also a valid flag when reversed.

Output of this script:

🇦🇬 (Antigua and Barbuda) reverses to 🇬🇦 (Gabon)
🇦🇱 (Albania) reverses to 🇱🇦 (Lao People's Democratic Republic)
🇦🇲 (Armenia) reverses to 🇲🇦 (Morocco)
🇦🇶 (Antarctica) reverses to 🇶🇦 (Qatar)
🇦🇸 (American Samoa) reverses to 🇸🇦 (Saudi Arabia)

treyhunner

"""
while n < 10 and chunk := f.read(256):  # SyntaxError

while n < 10 and (chunk := f.read(256)):  # Works

while chunk := f.read(256) and n < 10:  # chunk will be a boolean 😮

"""
from io import StringIO

treyhunner

class Rectangle:

    def __init__(self, width, height):
        self.width, self.height = width, height

    def __repr__(self):
        return f"Rectangle({self.width}, {self.height})"
 
    @property
    def area(self):

treyhunner

def easy_repr(obj):
    """
    Function to find the type of an object and its attributes

    Example:

        >>> class Point:
        ...     def __init__(self, x, y, z, color=None):
        ...         self.x, self.y, self.z = x, y, z
        ...         self.color = color

treyhunner

"""
Demonstration of how slow sum can be for flattening lists-of-lists

Output on my machine:
0.019118324998999014 itertools.chain.from_iterable
0.03325132900135941 comprehension
10.947899631002656 sum

Using sum on a list results in a loop inside a loop (a new list is made for
each new sub-list) so the more sub lists there are, the bigger the timing

treyhunner

# django.template.defaulttags.autoescape rewritten using Python 3.10's match/case statement
@register.tag
def autoescape(parser, token):
    """
    Force autoescape behavior for this block.
    """
    # token.split_contents() isn't useful here because this tag doesn't accept variable as arguments
    match token.contents.split():
        case [_, ('on' | 'off') as arg]:
            nodelist = parser.parse(('endautoescape',))