python从csv返回特定时间在特定服务器下使用许可证的次数

我有一个csv文件,名为user_log.csv。我需要计算在特定服务器上和每个特定时间使用每个许可证的次数。日志文件csv如下:

Report Date Time,Server,Licence,User,Host,In Use Since Date Time
02/02/2019 11:50,server1,teamcenter_author,user115,TcServer,02/02/2019 11:48
02/02/2019 11:50,server1,teamcenter_consumer,user133,TcServer,02/02/2019 08:57
02/02/2019 11:50,server2,teamcenter_consumer,user31,TcServer,02/02/2019 10:07
02/02/2019 11:50,server1,teamcenter_consumer,user120,TcServer,02/02/2019 10:15
02/02/2019 11:50,server1,visview_base,user120,client1,02/02/2019 05:14
02/02/2019 11:50,server1,visview_base,user12,client2,02/02/2019 07:19
02/02/2019 11:50,server1,visview_base,user95,client3,02/02/2019 11:10
02/02/2019 11:50,server3,NX12100N,user70,client4,02/01/2019 10:54
02/02/2019 11:50,server3,NX12100N_gateway,user70,client4,02/01/2019 10:54
02/02/2019 11:50,server3,NX12100N_solid_modeling,user70,client4,02/01/2019 10:54
02/02/2019 11:55,server1,teamcenter_author,user115,TcServer,02/02/2019 11:48
02/02/2019 11:55,server1,teamcenter_consumer,user133,TcServer,02/02/2019 08:57
02/02/2019 11:55,server1,teamcenter_consumer,user31,TcServer,02/02/2019 10:07
02/02/2019 11:55,server1,teamcenter_consumer,user120,TcServer,02/02/2019 10:15
02/02/2019 11:55,server1,visview_base,user120,client1,02/02/2019 05:14
02/02/2019 11:55,server1,visview_base,user12,client2,02/02/2019 07:19
02/02/2019 11:55,server1,visview_base,user95,client3,02/02/2019 11:10
02/02/2019 11:55,server1,visview_base,user115,TcServer,02/02/2019 11:50
02/02/2019 11:55,server3,NX12100N,user70,client4,02/01/2019 10:54
02/02/2019 11:55,server3,NX12100N_gateway,user70,client4,02/01/2019 10:54
02/02/2019 11:55,server3,NX12100N_solid_modeling,user70,client4,02/01/2019 10:54

我写的代码如下

file = open('/user_log.csv', "r")
reader= csv.reader(file)
time={}
for row in reader:
    licence_name = row[2]
    server = row[1]

    if licence_name in time.keys():
        if server in licence_name:
            time[row[2]][row[1]]['count'] += 1
        else:
            time.setdefault(licence_name,{}).setdefault(server,{})['count'] =1
    else:
        time.setdefault(licence_name,{}).setdefault(server,{})['count']=1

return render(request, "stats.html", {'no_of_line':time})

我得到的输出如下:

我该怎么做?