The path of Python Day8

1. Dynamic Import Module

Lib  = __import__ ("Lib.aa")
c = LIB.AA.C ()
Print (C.name)
Print (LIB.AA.C)

#下面为常用的方法
Import importlib
lib = importlib.import_module (' Lib.aa ')
Print (lib. C ())


2. Assertions

Example 1:

Assert  6 = = 6
Print (' 6 equals 6 ')
There's no problem with the appeal, so I'll print the following.

Example 2:

Assert type (2) is STR
Print (' G is str ')
The above example assertion is not valid, so it will be an error

Traceback (most recent):
File "/users/luobiao/pycharmprojects/s14/day7/lib/aa.py", line, in <module>
Assert type (2) is STR
Assertionerror

3. Write a simple SOCKETSSH client
1) server-side code

 import socket,os,time 
 
 #申明socket 
 Server = Socket.socket () 
 #进行ip绑定 
 server.bind (' localhost ', 6767) 
 #进行监听 
 Server.listen () 
 #进行循环等待 and receive connection and connection addresses 
 
 while True: 
 Conn,addr = server.accept () 
 pri        NT (CONN,ADDR) 
 while True: 
 #进行数据接收 
 data = CONN.RECV (1024x768) 
 #进行数据打印 and Decode 
 Print (Data.decode ()) 
 #调用os的popen模块 for command invocation 
 D = Os.popen (Data.decode ()). Read () 
 length = str (Len (D.encode ())) 
 If Len (d) = = 0: 
 d = ' Command error, please re-enter. '        
 #回传消息 
 Conn.send (Length.encode (encoding= ' utf-8 ')) 
 messages sent #socket粘包 two times are glued together, resulting in receive errors 
 #解决方案1: Use sleep for 0.5 seconds to get the buffer time-out so that two times the data is not in the same buffer 
 #time. Sleep (0.5) 
 #解决方案2: 
 Client_ack = conn.re CV (1024x768) #接收一个数据, let the client return information 
 Print (Client_ack.decode ()) 
 Conn.send (D.encode (encoding= ' utf-8 ')) 
 
 Ser Ver.close () 
 
 2) Customer Terminal code 
 
 

Import  Socket

#申明socket
Client = Socket.socket ()
#指定连接地址和端口
Client.connect ((' localhost ', 6060))

#循环发送给信息
While True:
    #让用户输入信息, imitating SSH input
    message = input (' >>: ')
    #发送消息, converts data of type str to bytes and converts it using encode
    Client.send (Message.encode (encoding= ' utf-8 '))
    #接收消息 and specifies the maximum amount of data to receive, in bytes
    Length = Client.recv (1024x768). Decode ()
    Client.send (' received size '. Encode (encoding= ' utf-8 '))
    Print (length)
    #打印消息并进行转码
    #print (Length.decode ())
    Recevied_size = 0
    while int (length) > recevied_size:
        data = CLIENT.RECV (1024)
        Recevied_size +=len (Data.decode ())
        Print (Data.decode ())
        Print (recevied_size)
    Else
        Print (' Receive complete ')
#关闭链接
Client.close ()

The path of Python Day8