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"""
It's possible to use multiple types of host pythons to create virtual environments and all should work:
- host installation
- invoking from a venv (if Python 3.3+)
- invoking from an old style virtualenv (<17.0.0)
- invoking from our own venv
"""
from __future__ import annotations
import sys
from subprocess import Popen
import pytest
from virtualenv.discovery.py_info import PythonInfo
CURRENT = PythonInfo.current_system()
# noinspection PyUnusedLocal
def root(tmp_path_factory, session_app_data): # noqa: U100
return CURRENT.system_executable
def venv(tmp_path_factory, session_app_data):
if CURRENT.is_venv:
return sys.executable
else:
root_python = root(tmp_path_factory, session_app_data)
dest = tmp_path_factory.mktemp("venv")
process = Popen([str(root_python), "-m", "venv", "--without-pip", str(dest)])
process.communicate()
# sadly creating a virtual environment does not tell us where the executable lives in general case
# so discover using some heuristic
exe_path = CURRENT.discover_exe(prefix=str(dest)).original_executable
return exe_path
PYTHON = {
"root": root,
"venv": venv,
}
@pytest.fixture(params=list(PYTHON.values()), ids=list(PYTHON.keys()), scope="session")
def python(request, tmp_path_factory, session_app_data):
result = request.param(tmp_path_factory, session_app_data)
if isinstance(result, Exception):
pytest.skip(f"could not resolve interpreter based on {request.param.__name__} because {result}")
if result is None:
pytest.skip(f"requires interpreter with {request.param.__name__}")
return result
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