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import socket

server_socket = socket.socket() 
hostname = socket.gethostname()
port = 12345
server_socket.bind((hostname, port))
server_socket.listen(1)
print("Welcome, Server is started!!")
print("Waiting for client request..")
client_socket, address = server_socket.accept()
print('Connected to client', address)
def calc_area(shape, *args):

    if   shape == '1':
         area = 3.14 * (args[0] ** 2)
         return area
    elif shape == '2':
         area = args[0] ** 2
         return area
    elif shape == '3':
         area = args[0] * args[1]
         return area
    elif shape == '4':
         area = 0.5 * args[0] * args[1]
         return area
    elif shape == '5':
         area = args[0] * args[1]
         return area 
    elif shape == '6':
         print ('Connection Closed')
         return client_socket.close()          

while True:
     data_from_client = client_socket.recv(1024).decode()
     data_from_client = data_from_client.split(',')
     shape_num = data_from_client[0] 
     args = [float(arg) for arg in data_from_client[1:]]
     area = calc_area(shape_num, *args)
     client_socket.send(str(area).encode())