count item in list

[korenron]

Hello,
how can I count part of items in list?

to be clear :
I have a list that build in this form
Final_List= [['10.0.0.1:Success', '10.0.0.2:Success', '10.0.0.3:Error', '10.0.0.4:Offline' , '10.0.0.5:Error']]

I want to know how much Succes\error\offline there is in the list (i don't mind the IP - just the total number)
I have try to run

ok = 0
error = 0
offline = 0 
for item in IP_List:
    if 'Success' in item:
        ok +=1
    if 'Error' in item:
        error +=1 
    if 'offline' in item:
        offline += 1 

maybe I used list.appand wrong?

Final_List.append(p.map(GetUplaudFies, Device_List))

GetUplaudFies return this

 return ip + ":" + Upload_Status