ericsnowcurrently

Summary:

• C-API takes opaque context type as first arg
• context is as specific as possible
• separate Py_Main() from runtime initialization
• separate global init from interpreter init
• explicit enabling/disabling runtime components

Background Info

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PyConfig Fields

field	type	used	modified	conditional
isolated	int
use_environment	int
dev_mode	int
install_signal_handlers	int
use_hash_seed	int

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_PyRuntimeState_GetThreadState()
    _PyRuntime.gilstate.tstate_current                                                                                  <----


_PyRuntimeGILState_GetThreadState()
    _PyRuntime.gilstate.tstate_current                                                                                  <----


_PyRuntimeGILState_SetThreadState(tstate)
    _PyRuntime.gilstate.tstate_current = tstate                                                                         <----

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Comparing:

left: https://github.com/Kronuz/cpython/commit/553d3c10172254b190078c50eb9f8e60522c8f41 right: https://github.com/Kronuz/cpython/commit/44b7e9b87676e0bccde43103a4c954c8d79de017 (aka kronuz/lazy_imports)

No change in performance

$ bench-jobs compare req-compile-bench-1666307353-esnow-linux req-compile-bench-1666307369-esnow-linux
[snip]

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import contextlib
import os
import sys


try:
    from io import StringIO as StdioStream
except ImportError:
    from StringIO import StringIO  # 2.7
    class StdioStream(StringIO):

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"""
This is a script for working around the lack of ensurepip in
Ubuntu's system Python installs.
See: https://bugs.launchpad.net/ubuntu/+source/python3.4/+bug/1290847

An alternative is the following:

  $ python3 -m venv --without-pip my-venv
  $ curl https://bootstrap.pypa.io/get-pip.py
  $ my-venv/bin/python3 get-pip.py

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API Shape for the Environments Discovery Component

Requirements

The environment component  API should support following:

1. Discover installed python interpreters: This includes identifying interpreter
   details like name, version, bit-ness, interpreter paths

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import importlib.machinery                                                                                                                                                            
import importlib.util                                                                                                                                                                 
import sys                                                                                                                                                                            
                                                                                                                                                                                      
                                                                                                                                                                                      
def load_lazydb(infile):                                                                                     

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import subprocess
args = [sys.executable, '-v', '-c', 'pass']
if not withsite:
    args.insert(1, '-S')
out = subprocess.check_output(args, stderr=subprocess.STDOUT).decode()
imported = [line.split("'")[1]
            for line in out.splitlines()
            if line.startswith("import '")]
for name in imported:
    try: