CountingtimezonesinpurePython [code]time_zones=[rec['tz']forrecinrecords] time_zones=[rec['tz']forrecinrecordsif'tz'inrec] time_zones[:10] defget_counts(sequence): counts={} forxinsequence: ifxincounts: counts[x]+=1 else: counts[x]=1 returncounts fromcollectionsimportdefaultdict defget_...