Write a python script to use existing access tokens to query Google Analytics Core Reporting API

I would like a python script written to query the Google Analytics corer reporting API using their python client [login to view URL] The script will not need to go through the entire OAuth flow. Important to note *** I have existing access tokens with refresh tokens *** These are in the same format as returned by Google Analytics when authenticating with OAuth. I have many access tokens. The python script will loop over each of these and perform multiple queries to Google Analytic for each token. The results from each query will be saved to a local json file. The file name will use the profile ID, queryname, plus a time stamp. example [login to view URL] The python script should also read in either an array, tuple or some object type where I will add each metric query. I would like to be able to add additional metric queries with dimensions and date ranges here as needed in the future. The script should be written in OOP and with best practices Thanks