How to use the apio.util.get_package_spec_version function in apio

def _setup_windows(self):
        profile = Profile()
        resources = Resources()

        self.name = 'drivers'
        self.version = util.get_package_version(self.name, profile)
        self.spec_version = util.get_package_spec_version(self.name, resources)

def __init__(self):
        profile = Profile()
        resources = Resources()

        self.name = 'system'
        self.version = util.get_package_version(self.name, profile)
        self.spec_version = util.get_package_spec_version(self.name, resources)

        self.ext = ''
        if 'Windows' == platform.system():
            self.ext = '.exe'

def __init__(self):
        profile = Profile()
        resources = Resources()

        self.name = 'examples'
        self.examples_dir = util.get_package_dir(self.name)
        self.version = util.get_package_version(self.name, profile)
        self.spec_version = util.get_package_spec_version(self.name, resources)