Python Basics-day34__python

Import socket

SK = Socket.socket ()
sk.setsockopt (socket. Sol_socket,socket. so_reuseaddr,1)
'
Add this sentence, you can resolve the alarm: address already in use.
We can reuse IP,
write before Bind (),
"

#udp版, the server client model
#1. Do not need to establish a connection, that is, the server side does not have listen (), accept (), the client does not connect ()
#2. Send and Receive methods are SendTo () and Recvfrom ()


#server. py Code
Import socket
SK = Socket.socket (type=socket. SOCK_DGRAM)
sk.bind ((' 127.0.0.1 ', 9090)) while
True:
    msg,client_addr= sk.recvfrom (1024)
    Print (Msg.decode (' Utf-8 '))
    INP = input (' >>> ')
    sk.sendto (Inp.encode (' Utf-8 '), client_addr)
sk.close ()


#client. PY Code,
Import socket
SK = Socket.socket (type=socket. SOCK_DGRAM)
while True:
    INP = input (' >>> ')
    sk.sendto (Inp.encode (' Utf-8 '), (' 127.0.0.1 '), 9090))
    msg,addr = Sk.recvfrom (1024)
    print (Msg.decode (' Utf-8 '))
Sk.close ()

"#下面是自己手打的版本, you need to understand the use of package import, #1. About the difference between importing the import socket and the FROM socket import *, #前者导入的是模块socket, so inheriting requires class XX (socket.so Cket): #后者是导入模块中的所有方法, so Inherit direct class XX (socket): #2. About inheriting existing classes, the implementation is more suitable for your class, #你要弄清, you are based on the original class, add some new properties or methods, in some cases, the method of overriding the parent class, about
    __REPR__ () What should you think??
#这个一定得看代码!!!!!!!
    #3. The function returns multiple arguments, which are returned as tuples, #4. About the following code, I started to forget to write return this keyword, although there is no error.  The return value of the #我开始没注意sendto (), which is the number of characters sent, Def mysendto (self, msg, addr): Returns Self.sendto (msg, addr) #client. Py from Practice.mysocket import Mysocket SK = Mysocket () while true:info = input (' >>> ') sk.mysendto (Info.enco De (' Utf-8 '), (' 127.0.0.1 ', 9999)) Sk.close () #server. py to practice.mysocket import mysocket SK = Mysocket () sk.bind ( ' 127.0.0.1 ', 9999) while true:msg, addr = Sk.myrecvfromm () print (' {} ' message: {} '. Format (addr, msg)) Sk.close () #my 
        socket.py Import Socket Class Mysocket (socket.socket): def __init__ (self,coding= ' utf-8 '): self.coding = coding Super (). __init__ (Type=socket. SoCk_dgram def myrecvfromm (self): msg, addr = Self.recvfrom (1024) return Msg.decode (self.coding), addr
 def mysendto (self, msg, addr): Return Self.sendto (msg, addr) '

# Time Synchronization Service: The client sends the desired time format, and the server sends the corresponding format according to this format,
#1.2018/05/04 16:44:51 The corresponding time format is:%y/%m/%d%h:%m:%s
#2. Time.strftime (), this function parameter is the time format and time, if there is no incoming time, the default is the local current time.



#client. py
Import time
import socket

SK = Socket.socket (type=socket. SOCK_DGRAM)
while True:
    sk.sendto ('%y/%m/%d%h:%m:%s '. Encode (' Utf-8 '), (' 127.0.0.1 ', 9090))
    ret,addr = Sk.recvfrom (1024)
    print (Ret.decode (' Utf-8 '))
    time.sleep (1)
sk.close ()



#server. Py
Import time
import socket

SK = socket.socket (type = socket. SOCK_DGRAM)
sk.bind ((' 127.0.0.1 ', 9090)) while
True:
    msg,addr = sk.recvfrom (1024)
    sk.sendto ( Time.strftime (Msg.decode (' Utf-8 ')). Encode (' Utf-8 '), addr)
sk.close ()