<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_net(self, entry):
 """Get the network for a specific row"""

        try:
            net = entry[1]
            return net[net.find('(')+1:net.find(')')]
        except IndexError:
            return None