def __init__(self, host, port, app, handler=None,
                 passthrough_errors=False, ssl_context=None):
        if handler is None:
            handler = WSGIRequestHandler
        self.address_family = select_ip_version(host, port)
        HTTPServer.__init__(self, (host, int(port)), handler)
        self.app = app
        self.passthrough_errors = passthrough_errors
        self.shutdown_signal = False

        if ssl_context is not None:
            try:
                from OpenSSL import tsafe
            except ImportError:
                raise TypeError('SSL is not available if the OpenSSL '
                                'library is not installed.')
            if isinstance(ssl_context, tuple):
                ssl_context = load_ssl_context(*ssl_context)
            if ssl_context is 'adhoc':
                ssl_context = generate_adhoc_ssl_context()
            self.socket = tsafe.Connection(ssl_context, self.socket)
            self.ssl_context = ssl_context
        else:
            self.ssl_context = None
dataset/ETHPy150Open Eforcers/gae-flask-todo/lib/werkzeug/serving.py/BaseWSGIServer.__init__/operator `==` -> `is`