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How to use _is_negated_factor method in tox

Best Python code snippet using tox_python

config.py

Source:config.py

...902        env = [e.split("#", 1)[0].strip() for e in env.split("\n")]903        env = ",".join([e for e in env if e])904        env = [env]905    return mapcat(_expand_envstr, env)906def _is_negated_factor(factor):907    return factor.startswith("!")908def _base_factor_name(factor):909    return factor[1:] if _is_negated_factor(factor) else factor910def _split_factor_expr(expr):911    def split_single(e):912        raw = e.split("-")913        included = {_base_factor_name(factor) for factor in raw if not _is_negated_factor(factor)}914        excluded = {_base_factor_name(factor) for factor in raw if _is_negated_factor(factor)}915        return included, excluded916    partial_envs = _expand_envstr(expr)917    return [split_single(e) for e in partial_envs]918def _split_factor_expr_all(expr):919    partial_envs = _expand_envstr(expr)920    return [{_base_factor_name(factor) for factor in e.split("-")} for e in partial_envs]921def _expand_envstr(envstr):922    # split by commas not in groups923    tokens = re.split(r"((?:\{[^}]+\})+)|,", envstr)924    envlist = ["".join(g).strip() for k, g in itertools.groupby(tokens, key=bool) if k]925    def expand(env):926        tokens = re.split(r"\{([^}]+)\}", env)927        parts = [re.sub(r"\s+", "", token).split(",") for token in tokens]928        return ["".join(variant) for variant in itertools.product(*parts)]...

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