django development workflow

not aligned correctly　　indexerror Subscript index is out of sequence boundary, for example, when X has only three elements, but tries to access X[5]　　Keyerror attempts to access keys that do not exist in the dictionary　　Keyboardinterrupt CTRL + C key is pressed　　nameerror Using a variable that has not been assigned to an object　　SyntaxError Python code is illegal, code cannot mutate　　TypeError The Incoming object type does not match the requirements　　Unboundlocalerror attempts to access a local

Python development [Django]: Time Processing, pythondjangoTime Format The time format in the database (02:10:44. 308638), formatted as the desired time (such as the year, month, and day). Next we will record how to process the time. 1. Time Format Group Class Article (models. model): nid = models. bigAutoField (primary_key = True) title = models. charField (verbose_name = 'Article title', max_length = 128)

: raise Http404 return render_to_response ("blog_show.html", {"blog": Blog})View CodeModify the blog directory below the urls.py, add the following contentURL (r'^blog/(? p','blog_show', name=' Detailblog'),Modify Blog_list.html H3 > {{Blog.caption}} H3 >Change it to H3 > href= "{% url ' detailblog ' blog.id%}"> {{blog.caption}} a > H3 >The special note is that Detailblog must bring the single quotation mark, again refreshes the next blog_list page, the blog title h

. BBS.objects.create (title=title, summary=summary,content=content, author=author,view_count=1 , ranking=1,# Created_at=models. Datetimefield (Auto_now_add=true),# Date created #updated_at = Models. Datetimefield (auto_now_add=true),# Modified date ) Returnhttpresponse ("At this point, the functionality is basically complete, but the system is simply a patchwork of Django content, with many problems, such as event handling.In the next section, we wi

+ - defwriteconf (f,data): theWith open (F,'W') as FD: * fd.write (data) $ Panax Notoginseng defparsedata (data): -host_conf ="' thehostgroup_conf ="' + forHginchData: AGroupName = hg['GroupName'] theMembers = [] + forHinchhg[' Members']: -hostname = h['hostname'] $ Members.append (hostname) $host_conf + = host_temp%h -hostgroup_conf + = hostgroup_temp% {'GroupName': GroupName,' Members':','. Join (members)} -fp_hostconf = Os.path.join (Conf_dir,'hosts.cfg') thefp_hostgroupconf =

--Note:1. Add type= ' file ' attribute in input box label input, and Name= ' ' denotes key;2.FILES in the request post, and the Property can contain data, otherwise files is an empty dictionary-like object;--Define the attribute as models. ImageField type; (Model Class)Pic = models. ImageField (upload_to='cars/')--If the property type is ImageField, you need to install the package pillowPip Install pillow==3.4.1--Image storage Path--/static/media/cars/picture file--setting.py file, add media_roo

)) forPinchSelf.pluginsifGetAttr (p,func_name,none)]Print(Plugin_funcs)#to add a to the plug-in method in ascending orderPlugin_funcs=[p forP,priorityinchSorted (plugin_funcs,key=LambdaX:x[1],reverse=False)] returnPlugin_chain (Plugin_funcs,len (Plugin_funcs) -1,_inner_func,*arg,**Kwargs)Else: returnFunc (self,*arg,**Kwargs)returnMethodSource code Description: Similar to @filter_hook just, note wrap_func=funcs[token] arg_specs =ge Targspec (Wrap_func) [0] if l

time I was using the JSON string as Val, still in the key-value pair, to be submitted in a x-www-form-urlencoded manner.Second, the file upload based on form formsModule section""Method="Post"Enctype="Multipart/form-data">User name"text"Name="User">Avatar"file"Name="Avatar"> "Submit">View sectiondef Index (Request): Print (request.body) # Raw Request body Data Print (Request. Get) # GET request data print(request. Post) # POST request data print(request. files) # uploade

the file name it defines -Files = Request. Files.get ("Imgfile", None) + ifFiles: Aresult =image_upload (Files, dir_name) at returnHttpResponse (Json.dumps (result), content_type="Application/json") - - #Directory Creation - defUpload_generation_dir (dir_name): -Today =Dt.datetime.today () -Dir_name = Dir_name +'/%d/%d/'%(Today.year,today.month) in if notOs.path.exists (settings. Media_root +dir_name): -Os.makedirs (settings. Media_root +dir_name) to returnDir_name + - #image

"HTTP protocol and JSON"1. HTTP protocolFeatures are as follows:(1) Support client/server mode.Simple and fast: When a customer requests a service from the server, it simply transmits the request method and path. The request method commonly has get, POST. Each method specifies a different type of contact between the customer and the server. Because the HTTP protocol is simple, the HTTP server's program size is small, so the communication speed is fast.(2) Flexible: HTTP allows the transfer of an

= = 1){ $('#user_name'). Next (). HTML ('User name exists'). Show (); Error_name=true; } Else{ $('#user_name'). Next (). Hide (); Error_name=false; } }); } 2.2view functions for validationdefCheck_username (Request):#If the user existsUsername = post.get (Request,'username') ifModels. User.objects.get (user_name=username):returnJsonresponse ({'ret': 1}) Else: return

Method of checking Form form is_valid ()We found that there are only two method methods in this function, which finally returns TRUE or False.Let's go in. Is_bound property, which determines whether the transmitted data is not empty and the upload file is not emptyPoint in. Errors found that this is a method disguised as a property, using the built-in decorator properties,Here is a simple logic to judge everyone to see, to determine whether there is an error message, no information on the implem

Start curd operations on data after the previous table has been built.DOS Input:>>>python manage.py ShellThe following commands are all tested in the shell(C) Increase:1 >>>importimport blog2'Frist blog' 'all')3 >>>b.save ()4 > >>b.id5 1Operations are saved to the database in the same way as the object. Save (), with the official words:To create a object, instantiate it using keyword arguments to the model class, then call Save () to save it to th E database.Machine translation: Create an obje

in file_obj.chunks(): file.write(item) return HttpResponse(json.dumps(ret))The main change is to generate the path to save the file, and return the path to the client.Here is the full code for HTML: A div with a picture preview is preset above. After the AJAX request is returned, get to the picture path (this path should be directly stitched to "127.0.0.1:8000" after the image can be accessed). Create an IMG tag, set SRC, and add it to the preview Div. Before adding it, c

#-*-coding:utf-8-*- 2 Importdatetime3 ImportOS4Os.environ.setdefault ('Django_settings_module','pureblog.settings') 5 6 ImportDjango7 Django.setup ()8 9 fromApps.modelsImportarticle, Category, TagTen One defpopulate (): Atags = [] -Cat_linux = Add_cat ('Linux') -Tag_ubantu = Add_tag ('Ubantu') theTag_redhat = Add_tag ('Redhat') - tags.append (Tag_ubantu) - tags.append (tag_redhat) -Add_article ('Title 1','P', Cat_linux, tags) + - defadd_article (title, status, Cat, tags): +A = Articl