python类html()的实例源码

def maybe_reexec(argv0=None):
    if sys.version_info >= (3,):
        return
    required_flags = dict(
        tabcheck=2,
        py3k_warning=1,
    )
    # https://docs.python.org/2/library/sys.html#sys.flags
    flag_to_option = dict(
        debug='d',
        py3k_warning='3',
        division_warning='Qwarn',
        division_new='Qnew',
        inspect='i',
        optimize='O',
        dont_write_bytecode='B',
        no_user_site='s',
        no_site='S',
        ignore_environment='E',
        tabcheck='t',
        verbose='v',
        unicode='U',
        bytes_warning='b',
        hash_randomization='R'
    )
    assert set(required_flags.keys()).issubset(flag_to_option.keys())
    argv = [sys.executable]
    reexec_needed = False
    for flag, option in flag_to_option.items():
        n = getattr(sys.flags, flag, 0)
        m = required_flags.get(flag, 0)
        if m > n:
            n = m
            reexec_needed = True
        if n > 0:
            if len(option) == 1:
                argv += ['-' + option * n]
            else:
                argv += ['-' + option] * n
    argv += argv0
    argv += sys.argv[1:]
    if reexec_needed:
        os.execv(argv[0], argv)