def is_running_on_macos():
    """
    Returns a truth value for a proposition: "the program is running on a
    macOS machine".

    :rtype: bool
    """
    pattern = re.compile('darwin', re.IGNORECASE)
    return False if not pattern.search(platform.platform()) else True
def is_running_on_macos():
    """
    Returns a truth value for a proposition: "the program is running on a
    macOS machine".

    :rtype: bool
    """
    pattern = re.compile('darwin', re.IGNORECASE)
    return False if not pattern.search(platform.platform()) else True
def is_running_on_macos ( ) : pattern = re . compile ( 'darwin' , re . IGNORECASE ) return False if not pattern . search ( platform . platform ( ) ) else True
Returns a truth value for a proposition: "the program is running on a
    macOS machine".

    :rtype: bool
Returns a truth value for a proposition : the program is running on a macOS machine .