Fast entry_points
Using entry_points
in your setup.py makes scripts that start really
slowly because it imports pkg_resources
, which is a horrible thing
to do if you want your trivial script to execute more or less instantly.
Check it out: pypa/setuptools#510
Importing fastentrypoints
in your setup.py file produces scripts
that looks (more or less) like this:
# -*- coding: utf-8 -*-
import re
import sys
from package.module import entry_function
if __name__ == '__main__':
sys.argv[0] = re.sub(r'(-script\.pyw?|\.exe)?$', '', sys.argv[0])
sys.exit(entry_function())
This is ripped directly from the way wheels do it and is faster than whatever the heck the normal console scripts do.
Note:
This bug in setuptools only affects packages built with the normal setup.py method. Building wheels avoids the problem and has many other benefits as well.
fastentrypoints
simply ensures that your user scripts will not automatically import pkg_resources, no matter how they are built.When using Python 3.8 and setuptools 47.2 (or newer), console scripts do not import pkg_resources.
Usage
To use fastentrypoints, simply copy fastentrypoints.py into your project
folder in the same directory as setup.py, and import fastentrypoints
in your setup.py file. This monkey-patches
setuptools.command.easy_install.ScriptWriter.get_args()
in the
background, which in turn produces simple entry scripts (like the one
above) when you install the package.
If you install fastentrypoints as a module, you have the fastep
executable, which will copy fastentrypoints.py into the working
directory (or into a list of directories you give it as arguments) and
append include fastentrypoints.py
to the MANIFEST.in file, and
add an import statement to setup.py. It is available from PyPI.
Be sure to add fastentrypoints.py
to MANIFEST.ini if you want to
distribute your package on PyPI.
Alternatively, you can specify fastentrypoints
as a build system
dependency by adding a pyproject.toml
file (PEP 518) with these lines to
your project folder:
[build-system] requires = ["setuptools", "wheel", "fastentrypoints"]
It is also possible to install it from PyPI with easy_install in the setup script:
try:
import fastentrypoints
except ImportError:
from setuptools.command import easy_install
import pkg_resources
easy_install.main(['fastentrypoints'])
pkg_resources.require('fastentrypoints')
import fastentrypoint
Let me know if there are places where this doesn't work well. I've
mostly tested it with console_scripts
so far, since I don't write
the other thing.
Test
There is one test. To run it, do test/runtest.py
. It installs a
dummy package with fastentrypoints and ensures the generated script is
what is expected.