init

client.py

+# This is a sample Python script.
+
+# Press ⌃R to execute it or replace it with your code.
+# Press Double ⇧ to search everywhere for classes, files, tool windows, actions, and settings.
+
+import socket
+
+s = socket.socket()
+host = socket.gethostname()
+port = 12345
+
+s.connect((host, port))
+
+while True:
+
+    msg = input('Wort eingeben: ')
+    if msg != 'STOP':
+        s.send(msg.encode('utf-8'))
+        bytes = s.recv(1024)
+        print(bytes.decode('utf-8'))
+    else:
+        break
+
+# See PyCharm help at https://www.jetbrains.com/help/pycharm/

server.py

+import socket
+
+s = socket.socket()
+host = socket.gethostname()
+port = 12345
+s.bind((host, port))
+s.listen()
+
+while True:
+    (connection, addr) = s.accept()
+    print('Verbindung von ', addr)
+    req = connection.recv(1024)
+    msg = req.decode('utf-8')
+    if msg != 'STOP':
+        msg = msg.upper()
+        connection.send(msg.encode('utf-8'))
+    else:
+        connection.close()
+