Python installs and writes a simple verification code component (with node)

1. Install Python

Download the response System version to the official website (for example, Windows here): https://www.python.org/downloads/windows/

And then there's the "Next Step",

2. Running

To be able to run at the command line like node, first configure the system's Global environment variables:

Win10 For example: "This Computer"---> Properties---> Advanced system settings---> "Environment variables" under "Advanced"---> Find "path"---> Add two variables (Python's installation directory and scripts in this directory)

Open cmd, Python can run, and Python Package Manager Pip can also run the

3. Developing the CAPTCHA component

Download the Pillow Library First:

Pip Install Pillow

photo.py:

#Introducing the Pillow library fromPILImportImage,imagedraw,imagefont#introduction of Randint for generating random int fromRandomImportRandint#Introducing SYSImportSYSW= Int (sys.argv[1]) H= Int (sys.argv[2]) FS= Int (sys.argv[3]) s= Sys.argv[4]#Create canvas with PIL image (color mode, (width, height), (color corresponds to maximum value))img = image.new ('RGB', (W,h), (255,255,255))#Create a brush with PiL Imagedraw GDGD =Imagedraw.draw (IMG)#loop to output text forIinchRange (len (s)):#for the following remember indent, or error    #Drawing TextGd.text (#Starting coordinate point(I*w/len (s) +randint (8,15), (H-FS)/2+randint ( -5,5)),        #the text to be drawnS[i],#Color(Randint (0,255), Randint (0,255), Randint (0,255)),        #FontImagefont.truetype ("C:\\windows\\fonts\\buxtonsketch.ttf", FS)) forIinchRange (20):    #for the following remember indent, or error    #Draw LineGd.line (#start and end coordinate points(Randint (0,w), Randint (0,h), Randint (0,w), Randint (0,h)),#Color(Randint (0,255), Randint (0,255), Randint (0,255)),        #line width1    ) forIinchRange (int (w*h/200)):    #for the following remember indent, or error    #Draw pointsGd.point (#coordinates(Randint (0,w), Randint (0,h)),#Color(Randint (0,255), Randint (0,255), Randint (0,255))    )#Save PictureImg.save ('1.png','PNG')

Run commands such as:

 $  -  SDFs

Generates a 200,100 font 50 code with the content "SDFs"

4. Use with node

Const KOA = require (' KOA ') Const Koarouter= Require (' Koa-router ') const CP= Require (' child_process ') Const FS= Require (' FS ') const static= Require (' koa-static ') const Server=NewKOA () Server.listen (8088) Const R=NewKoarouter () Server.use (R.routes ()) R.get ('/verify_code ', async CTX ={let {w,h,fs}=ctx.query W= W? w:200h= h? h:100FS= FS? Fs:50Let seeds= ' abcdefghijklimnopqrstuvwxyzABCDEFGHIJKLMNOPQRST2345678 'Let arr= []     for(Let i=0;i<5;i++) {Arr.push (Seeds[parseint (seeds.length*Math.random ())]) } Let Data= Await newverify (W,h,fs,arr.join (")).Catch(e=>{}) Ctx.body=data})functionnewverify (w,h,fontsize,str) {return NewPromise (Async (Resolve,reject) ={cp.exec (' Python photo.py ${w} ${h} ${fontsize} ${str} ', Err= {            if(Err) {reject ()} fs.readfile ('./1.png ', (err, data) = {                if(Err) {reject ()}Else{Resolve (data)}}) })})}server.use (Static ('./www '))

Python installs and writes a simple verification code component (with node)