How to use 'flask run host' in Python

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def _run_flask(self, host, port, debug=False, using_win32=False):
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    print host
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    if using_win32:
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        import pythoncom
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        pythoncom.CoInitialize()
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    self.flask_app.run(debug=debug, host=host, port=port,
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                       use_reloader=False)

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def run_flask(self):
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    """
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        Run flask or other framework specified
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    """
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    if isinstance(self.server, str):
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        if self.server.lower() == "flask":
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            self.flask_app.run(host=self.host, port=self.port)
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        elif self.server.lower() == "django":
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            if sys.platform in ['win32', 'win64']:
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                os.system("python manage.py runserver {}:{}".format(self.host, self.port))
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            else:
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                os.system("python3 manage.py runserver {}:{}".format(self.host, self.port))
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        else:
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            raise Exception("{} must be a function which starts the webframework server!".format(self.server))
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    else:
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        self.server()