Python small function

Directory

1. Uploading Files

2. Verification Code

First, upload files

First look at the request. FILES:

Dictionary request. Each entry in FILES is a UploadFile object. The UploadFile object has the following methods:
1, Uploadfile.read ():
Read all uploaded data from the file. When the upload file is too large, you may run out of memory and use caution.
2, Uploadfile.multiple_chunks ():
If the upload file is large enough to be split into multiple parts read-in, returns True. By default, returns True when the upload file is greater than 2.5M. However, this value can be configured.
3, Uploadfile.chunks ():
Returns a chunked generator for uploading files. If Multiple_chunks () returns TRUE, you must use Chrunks () in the loop instead of Read (). In general, the direct use of chunks () on the line.
4. Uploadfile.name: File name for uploading files
5, Uplaodfile.size: File size of uploaded files (bytes)

Django Normal version upload

models.py

Class UploadFile (models. Model):    username =models. Charfield (max_length=50)    UploadFile = models. Filefield (upload_to= './static/') #指定的upload目录相对于根目录下media目录    def __str__ (self):        return Self.username

　　

Index.html

<form method= "POST" enctype= "Multipart/form-data" >    <label> User name: </label><input type= "Text" Name= "username"/>    <label> files: </label><input type= "file" name= "UploadFile"/>    < Input type= "submit" value= "' Commit"/></form>

　

views.py

def index (Request):    if Request.method = = ' POST ':        un = Request. Post.get (' username ')        print (un)        f = Request. Files.get (' UploadFile ') # ' uploadfile ' matches the input name in the submission form, see GetList ()        filename = os.path.join (' static ', f.name)  #存放内容的目标文件        # 123 = Os.path.join (' static ', ' images ', filename.name) with        open (filename, ' WB ') as keys:            For chunk in F.chunks (): The #chunks () method splits the file into a block (<=2.5m) Iteration Object                keys.write (chunk)                #新数据表信息        models. UploadFile.objects.create (Username=un, Uploadfile=filename)        return httpresponse (filename + ' OK ')    return Render_to_response (' index.html ', {})

　　

Django from upload

models.py

Class UploadFile (models. Model):    username =models. Charfield (max_length=50)    UploadFile = models. Filefield (upload_to= './static/') #指定的upload目录相对于根目录下media目录    def __str__ (self):        return Self.username

　　

Mo.html

<form method= "POST" enctype= "Multipart/form-data" >{{uf.username}}{{Uf.uploadfile}}    <input type= " Submit "value=" ' Submission '/></form>

　　

forms.py

From Django Import Formsclass uploadform (forms. Form):    username = forms. Charfield ()    uploadfile = forms. Filefield ()

　　

views.py

DEF model (Request):    if Request.method = = ' POST ':        uf =forms. Uploadform (Request. Post,request. FILES)        if Uf.is_valid ():            username =uf.cleaned_data[' username ']            uploadfile=uf.cleaned_data[' UploadFile ']            u = models. UploadFile ()            u.username=username            u.uploadfile=uploadfile            u.save ()            return HttpResponse (' OK ')    uf = forms. Uploadform ()    return render_to_response (' mo.html ', {' UF ': uf})

　　

Ajax upload File HTML file

    <div>        {{uf.uploadfile}}       <input type= "button" id= "Submitj" value= "commit"/>   </div>    <script src= "/static/jquery-2.1.4.min.js" ></script><script>    $ (' #submitj '). Bind ("click", function () {        var file = $ (' #id_uploadfile ') [0].files[0];        Console.log ("fff", file);        var form = new FormData ();        Form.append (' uploadfile ', file);         $.ajax ({                type: ' POST ',                URL: '/mo/',                data:form,                processdata:false,  //Tell JQuery don't to Process the data                Contenttype:false,  //Tell JQuery isn't to set ContentType                success:function (ARG) {                }            })    }) </script>

　　

views.py

def uploadfile (Request):    print (Request. FILES)    uf = forms.uploadform (Request. POST, request. FILES)    print (Uf.is_valid ())    if Uf.is_valid ():        upoad = models. UploadFile ()        print (123234)        upoad.username = ' Alex '        upoad.uploadfile = uf.cleaned_data[' UploadFile ']        Upoad.save ()    return render (Request, ' ajax.html ', locals ())

　

forms.py

From Django Import Formsclass uploadform (forms. Form):    uploadfile = forms. Filefield ()

　　

models.py

Class UploadFile (models. Model):    username =models. Charfield (max_length=50)    UploadFile = models. Filefield (upload_to= './static/') #指定的upload目录相对于根目录下media目录    def __str__ (self):        return Self.username

　　

Second, Verification code views.py

Import ioimport osfrom django_code import check_codedef check_coder (Request):    Mstream = io. Bytesio ()    img, code = check_code.create_validate_code ()    img.save (Mstream, "GIF")    request.session[" Checkcode "] = code   # #写入session    print (Mstream.getvalue ())    return HttpResponse (Mstream.getvalue ())

　　

check_code.py file

#!/usr/bin/env python#Coding:utf-8ImportRandom fromPILImportImage, Imagedraw, Imagefont, imagefilter_letter_cases="Abcdefghjkmnpqrstuvwxy"  #lowercase letters To remove i,l,o,z that may interfere_upper_cases = _letter_cases.upper ()#Uppercase Letters_numbers ="'. Join (Map (str, RANGE (3, 10)))#DigitalInit_chars ="'. Join ((_letter_cases, _upper_cases, _numbers))defCreate_validate_code (size= (120, 30), chars=Init_chars, Img_type="GIF", Mode="RGB", Bg_color= (255, 255, 255), Fg_color= (0, 0, 255), Font_size=18, Font_type="Monaco.ttf", Length=4, Draw_lines=True, N_line= (1, 2), Draw_points=True, Point_chance= 2):    " "@todo: Generate CAPTCHA image @param size: The size of the picture, format (wide, high), default to (+), @param chars: Allowed character set, format string @param img_type: Picture saved Format, default is GIF, optional gif,jpeg,tiff,png @param mode: Picture mode, default is RGB @param bg_color: Background color, default is white @param fg_color: foreground color, captcha character color , the default is blue #0000ff @param font_size: captcha font size @param font_type: captcha font, default to Ae_alarabiya.ttf @param length: Number of captcha characters @p Aram Draw_lines: Whether the interference line @param N_lines: The number range of interference lines, the format tuple, the default is (1, 2), only valid when Draw_lines is true @param draw_points: whether to draw the interference point @ param point_chance: Probability of disturbance point occurrence, size range [0] @return: [0]: PIL image instance @return: [1]: string in captcha picture" "width, height= Size#wide, Highimg = image.new (mode, size, Bg_color)#Create a graphicDraw = Imagedraw.draw (img)#Create a brush    defget_chars ():" "generates a string of the given length, returning the list format" "        returnrandom.sample (chars, length)defcreate_lines ():" "Draw Interference Lines" "Line_num= Random.randint (*n_line)#number of interfering lines         forIinchRange (line_num):#starting pointBegin = (Random.randint (0, size[0]), Random.randint (0, size[1]))            #End PointEnd = (Random.randint (0, size[0]), Random.randint (0, size[1]) draw.line ([begin, end], fill=(0, 0, 0))defcreate_points ():" "Draw Interference points" "Chance= min (max (0, Int (point_chance)))#size limit in [0, +]         forWinchRange (width): forHinchRange (height): tmp= Random.randint (0, 100)                ifTMP > 100-Chance:draw.point ((W, h), fill=(0, 0, 0))defcreate_strs ():" "plotting Captcha characters" "C_chars=get_chars () STRs='%s'%' '. Join (C_chars)#spaces are separated by a space before and after each characterFont=Imagefont.truetype (Font_type, font_size) font_width, Font_height=font.getsize (STRs) Draw.text (((Width-Font_width)/3, (height-font_height)/3), STRs, Font=font, fill=Fg_color)return "'. Join (C_chars)ifDraw_lines:create_lines ()ifdraw_points:create_points () STRs=create_strs ()#graphic Warp Parametersparams = [1-float (Random.randint (1, 2))/100, 0, 0, 0,1-float (Random.randint (1, 10))/100, Float (random.randint (1, 2))/500,              0.001, Float (random.randint (1, 2))/500] img= Img.transform (Size, image.perspective, params)#Creating Distortionsimg= Img.filter (Imagefilter.edge_enhance_more)#filter, Edge enhancement (threshold value)    returnIMG, STRs

View Code

File connection Monaco.ttf font file

http://www.gringod.com/2006/02/24/return-of-monacottf/

Python small function