Python review-Chowder

Collection (Set) method

Union: Unions |

Intersection: Intersection &

Difference Set: Difference-

Symmetric difference set: symmetric_difference ^

Examples are as follows:

a={1,2,3,4,5}b={2,3,5,7,9}Print(A |b)PrintAb)Print(A ^b)Print(A &b)Print("*"*50)Print("*"*50)Print(a.union (b))Print(a.difference (b))Print(a.symmetric_difference (b))Print(a.intersection (b))######{1, 2, 3, 4, 5, 7, 9}{1, 4}{1, 4, 7, 9}{2, 3, 5}****************************************************************************************************{1, 2, 3, 4, 5, 7, 9}{1, 4}{1, 4, 7, 9}{2, 3, 5}

function comment

You can annotate the parameters of a function and the type of the return value when you define a function

Attention:

1) function comments only refer to prompt action, and do not type check and limit the input parameters or return values

2) function comments can be viewed through function.__annotations__

defFoo (x:int, Y:float)Str:returnSTR (x +y)Print(foo (3, 4))Print(Foo ('a','b'))Print(foo.)__annotations__)7ab{  "  x   ": < class   " int  ",  " y   ": <class   " float  ",  "  return   ": <class  "  str   " >}  defF (ham:str, eggs:str ='eggs'),Str:Print("Annotations:"F.__annotations__)     Print("Arguments:", ham, eggs)returnHam +' and'+EGGSF ('spam')Annotations: { 'Ham': <class 'Str','return': <class 'Str','eggs': <class 'Str'>}arguments:spam Eggs'spam and Eggs'

Requests module Add request header

Django receives the data submitted by the requests module, and needs to add a custom request header to follow certain rules

1) Dictionary headers defines the key-value pair for the request header, with the word split between the words in the key (_ segmentation is not recognized)

2) After the request header arrives at the service end, it exists in the dictionary after parsing requests. META

3) The key of the client request header has changed on the service side

1. Add HTTP_ before client's key

2. Convert the above processed keys to uppercase

3. Replace-to _

Auth-api ====> request. Meta.get ("Http_auth_api")

Import requests
Response=requests.get ("http://127.0.0.1:8000/test.html", headers={'  Auth-api': Auth_header_val})
Print (Response.text)

Part of the source code is as follows ( need further finishing )

#django. core.servers.basehttp.py
ClassWsgirequesthandler (simple_server. Wsgirequesthandler, Object): ...defGet_environ (self):#Strip all headers with underscores in the name before constructing        #The WSGI environ. This prevents header-spoofing based on ambiguity        #between underscores and dashes both normalized to underscores in WSGI        #env VARs. Nginx and Apache 2.4+ both do the as well.  for K, V in   self.headers.items ():  if '_' 
    
     in 
      k:  
     del 
      self.headers[k]         
    returnSuper (Wsgirequesthandler, self). Get_environ ()

 #wsgiref. simpleserver.py

ClassWsgirequesthandler (Basehttprequesthandler): Server_version="wsgiserver/"+__version__    defGet_environ (self): env=self.server.base_environ.copy () env['Server_protocol'] =self.request_version env['Server_software'] =self.server_version env['Request_method'] =Self.commandif '?' inchSelf.path:path,query= Self.path.split ('?', 1)        Else: Path,query= Self.path,"'env['Path_info'] = urllib.parse.unquote (path,'iso-8859-1') env['query_string'] =Query Host=self.address_string ()ifHost! =Self.client_address[0]: env['Remote_host'] =host env['REMOTE_ADDR'] =Self.client_address[0]ifSelf.headers.get ('Content-type') isnone:env['Content_Type'] =Self.headers.get_content_type ()Else: env['Content_Type'] = self.headers['Content-type'] Length= Self.headers.get ('Content-length')        iflength:env['content_length'] =length forKvinchSelf.headers.items (): k =k.replace ('-','_'). Upper ();v=V.strip ()ifKinchenv:Continue                    #Skip content length, type,etc.            if 'HTTP_'+kinchenv:env['HTTP_'+k] + =','+v#comma-separate Multiple Headers            Else: env[  'http_'+k] =vreturnEnv

Python review-Chowder