Method to return the column based on multiple conditions in Python

I have a dataframe as below. Based on few conditions, I need to retrive the column.

    Wifi_User1      Wifi_User2      Wifi_User3      Thermostat   Act_User1   Act_User2  Act_User3
    -58             -48             -60             18              0               1           0
    -60             -56             -75             18              0               1           1
    -45             -60             -45             18              0               1           1
    -67             -45             -60             18              1               0           1
    -40             -65             -65             18              1               0           1
    -55             -78             -74             18              1               0           0
    -55             -45             -65             18              1               0           0
    -67             -45             -44             18              0               0           0
    -65             -68             -70             18              0               0           0
    -70             -70             -65             24              0               0           0
    -72             -56             -45             24              0               1           0
    -75             -45             -60             24              0               1           0
    -77             -48             -65             24              0               0           0

The conditions are as follows:

if (Wifi_User1==Wifi_User2) or (Wifi_User2==Wifi_User3) or (Wifi_User3==Wifi_User1) or (Wifi_User1==Wifi_User2==Wifi_User3) and when the thermostat value is changing

then scan Act_User1, Act_User2, Act_User3 columns for the first instance of 1 before the thermostat value changes.

If its Act_user1, return 1 
else if its Act_User2 return 2
else return 3

For example, in the above dataset, at 10th row Wifi_user1 == Wifi_User2 and the thermostat value is changing from 18 to 24.

For this condition, I will scan Act_User1, Act_User2, Act_User3. And see that, the first instance of 1 occurs for Act_User1, hence I need to return the value 1 in the new column for this particular row.

Please help me as how to go about it, as I'm new to Python and exploring python