The reflection of Python learning

Python Learning reflex

Example 1

The script reads as follows:

#coding: UTF8 Class MyClass (object): def fax (self): print ' faxing .... ' def copy (self): print ' Copying ... ' def printing (): print ' Printing .... ' m = MyClass () If Hasattr (M, ' fax '): #判断myClass类中是否有fax方法 Func = GetAttr (M, ' fax ') #返回内存对象 Func () #调用 SetAttr (M, ' print2 ', printing) M.print2 () Try #delattr (M, ' copy ') #print Name #print DFDF #print TTTT Print m Except Attributeerror,e: print ' something wrong. ', E Except Exception,e: Print E Finally print '-----------' #else: # print "Print nothing wrong ...."

The execution script results are as follows:

Faxing ....

Printing ....

<__main__.myclass Object at 0x028211d0>

-----------

Example 2

The script reads as follows:

#/usr/bin/env python #coding: UTF8 Import Sys Class WebServer (object): def __init__ (Self,host,port): Self.host = Host Self.port = Port def start (self): Print "Server is starting ..." def stop (self): Print "Server is stopping ..." def restart (self): Self.stop () Self.start () if __name__ = = "__main__": Server = WebServer (' localhost ', 80) #print Sys.argv[1] Cmd_dic = { ' Start ': Server.start, ' Stop ': server.stop, ' Restart ': Server.restart, } #if sys.argv[1] = = ' Start ': If sys.argv[1] in Cmd_dic: CMD_DIC[SYS.ARGV[1]] ()

The execution script results are as follows:

D:\Python learn \ Script Learn >python reflection 01.py Start

Server is starting ...

Modify the above script as follows:

#/usr/bin/env python #coding: UTF8 Import Sys Class WebServer (object): def __init__ (Self,host,port): Self.host = Host Self.port = Port def start (self): Print "Server is starting ..." def stop (self): Print "Server is stopping ..." def restart (self): Self.stop () Self.start () if __name__ = = "__main__": Server = WebServer (' localhost ', 80) If Hasattr (Server,sys.argv[1]): Func = GetAttr (server,sys.argv[1]) # #获取server. Start memory address Func () # #相当于server. Start ()

The execution script results are as follows:

D:\Python learn \ Script Learn >python reflection 02.py Start

Server is starting ...

D:\Python learn \ Script Learn >python reflection 02.py Stop

Server is stopping ...

Modify the above script as follows:

#/usr/bin/env python #coding: UTF8 Import Sys Class WebServer (object): def __init__ (Self,host,port): Self.host = Host Self.port = Port def start (self): Print "Server is starting ..." def stop (self): Print "Server is stopping ..." def restart (self): Self.stop () Self.start () def test_run (name): Print "Running ...", name if __name__ = = "__main__": Server = WebServer (' localhost ', 80) If Hasattr (Server,sys.argv[1]): Func = GetAttr (server,sys.argv[1]) # #获取server. Start memory address Func () # #相当于server. Start () SetAttr (server, ' run ', Test_run) # #test_run以run身份绑定到server实例中 Server.run (' Peng ') # #类似执行test_run (' Peng ')

The execution script results are as follows:

D:\Python learn \ Script Learn >python reflection 03.py Start

Server is starting ...

Running ... Peng

Modify the above script as follows:

#/usr/bin/env python #coding: UTF8 Import Sys Class WebServer (object): def __init__ (Self,host,port): Self.host = Host Self.port = Port def start (self): Print "Server is starting ..." def stop (self): Print "Server is stopping ..." def restart (self): Self.stop () Self.start () def test_run (self,name): Print "Running ...", name,self.host if __name__ = = "__main__": Server = WebServer (' localhost ', 80) If Hasattr (Server,sys.argv[1]): Func = GetAttr (server,sys.argv[1]) # #获取server. Start memory address Func () # #相当于server. Start () SetAttr (server, ' run ', Test_run) # #test_run以run身份绑定到server实例中 Server.run (server, ' Peng ') # #类似执行test_run (' Peng ')

The execution script results are as follows:

D:\Python learn \ Script Learn >python reflection 04.py Start

Server is starting ...

Running ... peng localhost

Modify the above script as follows:

#/usr/bin/env python #coding: UTF8 Import Sys Class WebServer (object): def __init__ (Self,host,port): Self.host = Host Self.port = Port def start (self): Print "Server is starting ..." def stop (self): Print "Server is stopping ..." def restart (self): Self.stop () Self.start () def test_run (self,name): Print "Running ...", name,self.host if __name__ = = "__main__": Server = WebServer (' localhost ', 80) If Hasattr (Server,sys.argv[1]): Func = GetAttr (server,sys.argv[1]) # #获取server. Start memory address Func () # #相当于server. Start () Delattr (WebServer, ' start ') Print Server.restart () #setattr (server, ' run ', Test_run) # #test_run以run身份绑定到server实例中 #server. Run (server, ' Peng ') # #类似执行test_run (' Peng ')

The execution script results are as follows:

D:\Python Learning \ Script Learning >python reflection 05.py Restart

Server is stopping.---Executes a call to Func ()

Server is starting ... ---"Executes a call to Func ()

Server is stopping ... ---is executing a call to Server.restart ()

Traceback (most recent):

File "Reflection 05.py", line +, in <module>

Print Server.restart ()

File "Reflection 05.py", line, in restart

Self.start ()

Attributeerror: ' WebServer ' object has no attribute ' start ' ---executed by the call of Server.restart () , at which start has been deleted, so reported "' WebServer ' object has no attribute ' start ' ERROR!!!

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The reflection of Python learning