David Ellis DavidCEllis

## dataclass_preprocess.py
import inspect
from copy import copy
from dataclasses import dataclass, field, fields, Field
from typing import Annotated, Any, ClassVar, get_origin


# Modifying objects
class FieldModifier:
    __slots__ = ("modifiers", )
    modifiers: dict[str, Any]

## on_dataclasses_import_speed.md

      
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                DavidCEllis
                / on_dataclasses_import_speed.md
            
            
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              April 18, 2024 15:04
            
          
    Improving Dataclasses' Import Speed

I've seen the committers thread
on trying to improve dataclasses' start time performance but it seemed focused on the execution time,
while that is an area to look at I think it may be worth looking at improving the import time of dataclasses itself.
I've been working on my own implementation of the same idea and had
found that importing some stdlib modules had a significant impact on the overall time it took to run. On looking at
dataclasses I noticed that it also imported some of the same modules.

  
## namespace_impact_on_python_launch_performance.md

      
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                / namespace_impact_on_python_launch_performance.md
            
            
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              December 22, 2022 18:16
            
              
                Import time differences when a namespace package is installed
              
          
    Import performance tests

When I was working on performance for prefab_classes I noticed that on recreating my venv
the output from importtime had changed. It turns out that this was due to the original
venv having sphinx installed. In particular the sphinxcontrib namespace packages.
Having these installed results in importlib.util being imported on python launch which
pulls in a number of other python modules.
Two commands used to check performance.

  
## filedialogs.py
"""
Quick tkinter file dialogs for scripts.
Returns Path objects or None.
Hides the main tkinter window with a context manager.

I kept remaking this or copying it from project to project for short scripts so here it is for easier copy/paste.

See https://docs.python.org/3/library/dialog.html#module-tkinter.filedialog for options.
"""

## jsimport.py
"""
Python Javascript importer
(Python 3.6+ - may work on earlier if you remove the f-strings)

Requires js2py: https://github.com/PiotrDabkowski/Js2Py

pip install js2py

This is a little import hook that takes advantage of
js2py in order to translate javascript to python during

## shuffle_builtins.py
"""
An alternative approach to making code Python 3.6 only

The new dict implementation means the original and new
builtin lists should be identical in Python 3.6

Inspired by a friend's tweet mentioning that someone had used str
as a variable name in an inherited codebase.

Python 2 Behavior:
	import inspect
	from copy import copy
	from dataclasses import dataclass, field, fields, Field
	from typing import Annotated, Any, ClassVar, get_origin


	# Modifying objects
	class FieldModifier:
	__slots__ = ("modifiers", )
	modifiers: dict[str, Any]
	"""
	Quick tkinter file dialogs for scripts.
	Returns Path objects or None.
	Hides the main tkinter window with a context manager.

	I kept remaking this or copying it from project to project for short scripts so here it is for easier copy/paste.

	See https://docs.python.org/3/library/dialog.html#module-tkinter.filedialog for options.
	"""
	"""
	Python Javascript importer
	(Python 3.6+ - may work on earlier if you remove the f-strings)

	Requires js2py: https://github.com/PiotrDabkowski/Js2Py

	pip install js2py

	This is a little import hook that takes advantage of
	js2py in order to translate javascript to python during
	"""
	An alternative approach to making code Python 3.6 only

	The new dict implementation means the original and new
	builtin lists should be identical in Python 3.6

	Inspired by a friend's tweet mentioning that someone had used str
	as a variable name in an inherited codebase.

	Python 2 Behavior: