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How to use auto_detect_cpus method in tox

Best Python code snippet using tox_python

parallel.py

Source:parallel.py

2from argparse import ArgumentTypeError3ENV_VAR_KEY = "TOX_PARALLEL_ENV"4OFF_VALUE = 05DEFAULT_PARALLEL = OFF_VALUE6def auto_detect_cpus():7    try:8        from os import sched_getaffinity  # python 3 only9        def cpu_count():10            return len(sched_getaffinity(0))11    except ImportError:12        # python 2 options13        try:14            from os import cpu_count15        except ImportError:16            from multiprocessing import cpu_count17    try:18        n = cpu_count()19    except NotImplementedError:  # pragma: no cov20        n = None  # pragma: no cov21    return n if n else 122def parse_num_processes(s):23    if s == "all":24        return None25    if s == "auto":26        return auto_detect_cpus()27    else:28        value = int(s)29        if value < 0:30            raise ArgumentTypeError("value must be positive")31        return value32def add_parallel_flags(parser):33    parser.add_argument(34        "-p",35        "--parallel",36        dest="parallel",37        help="run tox environments in parallel, the argument controls limit: all,"38        " auto - cpu count, some positive number, zero is turn off",39        action="store",40        type=parse_num_processes,...

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