Creating List of nested class in Python

I'm trying to create an Hierarchical data structure with nested classes. I have a file that has several NET's and each NET has several PORT's. So I want to go over the file in one swap and collect all data at once. I tried the following code:

        """Parent Class to all PORTS children classes"""
        def __init__(self, name):
            self.name = name
            self.port = Net.Port(x_cord = None)
            
        def display(self):
            print("Inside Net Display")
            print("Net name:",self.name)
        
        def reveal(self):
            ## Calling the inner class Port
            self.port.port_display("Calling inner class Port from outer class Net")
            
        def show_classes(self):
            print("Net class:", self.display())
            print("Port class:",self.port.display())
            
        class Port:
            """Inner class in Net class"""
            def __init__(self, x_cord):
                self.x_cord = x_cord
                
            def display(self):
                print("Inside Port display")
                print(self.x_cord)

So now I create the NET class and the port instances:

net_0 = Net("Net_10")
port_0 = net_0.port
port_1 = net_0.port

# initializing port_0 
port_0.x_cord = 5
port_0.display()
# output:
Inside Port display
5
# when looking at port_1 i see that it is the same as port_0
port_1.display()
Inside Port display
5

what actually happened is that I created two port instances, but they were the same one. port_0 <main.Net.Port at 0x27649b40d60> port_1 <main.Net.Port at 0x27649b40d60>

how can I create two different sub cells of port?

thanks, GB