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This article introduces the knowledge of "how to set the CAPTCHA function in python". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

1. Import the module and define a validation status

From pil import image, imagedraw, imagefontfrom django.utils.six import bytesiodef verify_code (request): # introduce random function module import random # to define variables Background color, width, height bgcolor = (random.randrange (20,100), random.randrange (20,100), 255) width = 100height = 25 # create picture object im = image.new ('rgb', (width, height), bgcolor) # create brush object draw = imagedraw.draw (im) # call point () function of the brush to draw noise for i in range (0100): xy = (random.randrange (0, width)) Random.randrange (0, height)) fill= (random.randrange (0255), 255,255, random.randrange (0255)) draw.point (xy, fill=fill) # defines the optional value of the CAPTCHA str1 = 'abcd123efghijk456lmnopqrs789tuvwxyz0' # randomly selects four values as the CAPTCHA rand_str =' 'for i in range (0,4): rand_str + = str1 [random.randrange (0, len (str1))] # to construct the font object The font path of ubuntu is "/ usr/share/fonts/truetype/freefont" font= imagefont.truetype ('freemono.ttf', 23) # construct font color fontcolor = (255, random.randrange (0,255), random.randrange (0255)) # draw four words draw.text ((5,2), rand_str [0], font=font, fill=fontcolor) draw.text ((25,2), rand_str [1], font=font, fill=fontcolor) draw.text ((50,2) Rand_str [2], font=font, fill=fontcolor) draw.text ((75,2), rand_str [3], font=font, fill=fontcolor) # release brush del draw # save to session Used for further verification request.session ['verifycode'] = rand_str # memory file operation buf = bytesio () # Save the picture in memory, the file type is png im.save (buf,' png') # return the image data in memory to the client, and the mime type is picture png return httpresponse (buf.getvalue (), 'image/png')

3. Put it directly into the img in the web page

4. Use ajax to obtain authentication password and account number

Login

Please enter a verification code

Remember the password

Click to get cookies $(function () {$('# ajax') .click (function () {username = $('# username'). Val (); password = $('# password'). Val (); ow = $("# ow"). Val (); yum = $('# yum'). Val () $.ajax ({'url':' / loginajax', 'type':' post', 'data': {' username': username, 'password': password, "yum": yum,} 'success':function (data) {/ / successful login returns 1 / / login failure returns 0 / / Verification failure returns 3 if (data.res = = 1) {$('.show') .show () .html ('login successful')} else if (data.res = = 0) { $('.show') .show () .html ('login failed')} else if (data.res = = 3) {$('.show') .show () .html ('CAPTCHA input failed') );})

The account password and verification code are sent to the server in the ajax above.

In the validation function

Yzm = request.post.get ('yum') # get the incoming CAPTCHA vaue = request.session [' verifycode'] # save the CAPTCHA in session when generating the picture if yzm! = vaue: # if it is not equal, 3 html ajax will be returned and verification error return jsonresponse ({'res':3}) will be displayed.

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