gistfile1.py

# Current version:

def csv_file(func):
    @wraps(func)
    def csvout(self, session):
        cherrypy.response.headers['Content-Type'] = 'application/csv'
        cherrypy.response.headers['Content-Disposition'] = 'attachment; filename=' + func.__name__ + '.csv'
        writer = StringIO()
        func(self, csv.writer(writer), session)
        return writer.getvalue().encode('utf-8')
    return csvout


# Version that supports query parameters:

def csv_file(func):
    @wraps(func)
    def csvout(self, session, **params):  # <- note that we added **params
        cherrypy.response.headers['Content-Type'] = 'application/csv'
        cherrypy.response.headers['Content-Disposition'] = 'attachment; filename=' + func.__name__ + '.csv'
        writer = StringIO()
        func(self, csv.writer(writer), session, **params)  # <- and we also added **params here
        return writer.getvalue().encode('utf-8')
    return csvout