Python: socket - run server and client from the same pc

Hy, I just forwarded my ports and my Python Server client chat <---> works as expected when starting the client from another PC.

When I try to connect a client from my own computer (where the server file itself is located), I get his error:

OSError: [WinError 10048] Only one usage of each socket address (protocol/network address/port) is normally permitted

      

        
        
        
      

    

Q1: This means only 1 app can connect to a specific port, right?

Q2: How can I develop both my server and my client on the same PC? (I have no other PCs for this)

If needed, here is my code. (I just started so NOT JUDGE)

SERVER:

from tkinter import *
#from mysql.connector import (connection)
import socket
from _thread import *

import sys
root = Tk()
T = Text(root, height=2, width=30)
T2 = Text(root, height=2, width=30)
B = Button(root, text="Send")
T.pack(side=LEFT,fill=X)
T2.pack(side=TOP,fill=X)
B.pack(side=LEFT,fill=X)




#statick ip
host = 'x.x.x.x'
port=yyyy
s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
s.bind((host,port))

try:
    s.bind((host,port))
except socket.error as e:
    print(str(e))

s.listen(5)
print("waiting for connection")
def threaded_client(conn):
    conn.send(str.encode("Connection with the server established\n"))

while True:
    data = conn.recv(2048)
    reply = "You: " + data.decode('utf-8')
    if not data:
        break
    conn.sendall(str.encode(reply))
conn.close()

while True:
    conn, addr = s.accept()
    print('connected to: '+ addr[0]+':'+str(addr[1]))
    start_new_thread(threaded_client,(conn,))
root.mainloop()

      

        
        
        
      

    

CUSTOMER:

from tkinter import *
import socket

print("everything is imported")

s = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
print("socket is established")
#the public ip
host = 'y.y.y.y'
port=xxxx
s.connect((host,port))

print("s.connect done")

def sendShit(event):
    textToSend = T.get("1.0",END)
    s.send(str.encode(textToSend))
    T2.insert(END, s.recv(1024))

print("sendshit defined")

root = Tk()
T = Text(root, height=2, width=30)
T2 = Text(root, height=2, width=30)
B = Button(root, text="Send")
T.pack(side=LEFT,fill=X)
T2.pack(side=TOP,fill=X)
B.pack(side=LEFT,fill=X)
T.insert(END, "Type here")
T2.insert(END, s.recv(1024))
B.bind("<Button-1>",sendShit)
mainloop()