How to use basepython_default method in tox

Best Python code snippet using tox_python

config.py

Source:config.py

...273    # add various core venv interpreter attributes274    parser.add_testenv_attribute(275        name="envdir", type="path", default="{toxworkdir}/{envname}",276        help="venv directory")277    def basepython_default(testenv_config, value):278        if value is None:279            for f in testenv_config.factors:280                if f in default_factors:281                    return default_factors[f]282            return sys.executable283        return str(value)284    parser.add_testenv_attribute(285        name="basepython", type="string", default=None, postprocess=basepython_default,286        help="executable name or path of interpreter used to create a "287             "virtual test environment.")288    parser.add_testenv_attribute(289        name="envtmpdir", type="path", default="{envdir}/tmp",290        help="venv temporary directory")291    parser.add_testenv_attribute(...

version_utils.py

Source:version_utils.py

1import re2import sys3from tox.interpreters import InterpreterInfo4# tox sets TestenvConfig.basepython to sys.executable5# if the testenv doesn't ask for something more specific.6TOX_DEFAULT_BASEPYTHON = sys.executable7def basepython_to_gh_python_version(basepython: str) -> str:8    """9    Map a tox TestenvConfig basepython string to a10    GitHub actions/setup-python python-version string.11    E.g.: "python3.10" --> "3.10" or "pypy3.8" --> "pypy-3.8"12    """13    # (See `basepython_default` in tox.config for potential values14    # of basepython, from tox factors like py310 or pypy38.)15    # ??? Maybe use tox.interpreters.py_spec.PythonSpec.from_name instead?16    if basepython == TOX_DEFAULT_BASEPYTHON:17        return ""18    match = re.fullmatch(r"(python|pypy|jython)(\d+(\.\d+)?)?", basepython)19    if not match:20        raise ValueError(f"Unexpected basepython format {basepython!r}")21    implementation = match[1]22    version = match[2] or ""23    if implementation == "python":24        return version25    elif version:26        return f"{implementation}-{version}"27    else:28        return implementation29def python_version_to_prerelease_spec(python: str) -> str:30    """31    Expand a python-version string to allow prerelease Python,32    using SemVer ranges. (Doesn't currently handle pypy.)33    >>> python_version_to_prerelease_spec("3.7")34    '3.7.0-alpha - 3.7'35    Only handles tox-factor-generated N.M versions36    (not N and not N.M.P):37    >>> python_version_to_prerelease_spec("3")38    '3'39    >>> python_version_to_prerelease_spec("3.5.7")40    '3.5.7'41    """42    match = re.fullmatch(r"^(|pypy-|jython-)(\d+\.\d+)$", python)43    if match:44        implementation = match[1]45        version = match[2]46        if implementation == "":47            python = f"{implementation}{version}.0-alpha - {version}"48    return python49def interpreter_info_to_version(python_info: InterpreterInfo) -> str:50    """Format a GH python-version string from tox InterpreterInfo"""51    version = format_version_info(python_info.version_info)52    if python_info.extra_version_info:53        extra_version = format_version_info(python_info.extra_version_info)54        version = f"{version}-{extra_version}"55    implementation = python_info.implementation.lower()56    if implementation != "cpython":57        version = f"{implementation}-{version}"58    return version59def format_version_info(version_info: (int, int, int, str, int)) -> str:60    """Format a sys.version_info-style Python version tuple to a string"""61    (major, minor, micro, releaselevel, serial) = version_info62    version = f"{major}.{minor}.{micro}"63    if releaselevel != "final" or serial != 0:64        version += f"-{releaselevel}.{serial}"...

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