Flask

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Basics

Source: blog.miguelgrinberg.com

Installation:

pip3 install flask

Hello World

from flask import Flask
app = Flask(__name__)

@app.route('/')
def hello_world():
   return 'Hello World’

if __name__ == '__main__':
   app.run()
  • Access the above app from:
http://127.0.0.1:5000/

Parameters

  • All parameters are optional:
app.run(host, port, debug, options)

Explanation:

host: Hostname to listen on. Defaults to 127.0.0.1 (localhost). Set to ‘0.0.0.0’ to have server available externally
port: Defaults to 5000
debug: Defaults to false. If set to true, provides a debug information
options: To be forwarded to underlying Werkzeug server.
  • Enable Debugging:
app.debug = True
  • Access URL over network with custom port:
app.run(host = '0.0.0.0',port=5005)

Uploader Project

Source: tutorialspoint.com

nano upload_test.py
from flask import Flask, render_template, request
from werkzeug import secure_filename
app = Flask(__name__)

@app.route('/upload')
def upload_file():
   return render_template('upload.html')
	
@app.route('/uploader', methods = ['GET', 'POST'])
def upload_file():
   if request.method == 'POST':
      f = request.files['file']
      f.save(secure_filename(f.filename))
      return 'file uploaded successfully'
		
if __name__ == '__main__':
   app.run(debug = True, host = '0.0.0.0')
mkdir templates && cd templates
nano upload.html
<html>
   <body>
   
      <form action = "http://10.10.10.1:5000/uploader" method = "POST" 
         enctype = "multipart/form-data">
         <input type = "file" name = "file" />
         <input type = "submit"/>
      </form>
      
   </body>
</html>

File Structure:

.
├── templates
│   └── upload.html
└── upload_test.py

Run the application:

python3 upload_test.py

Access the application on below URL:

http://10.10.10.1:5000/upload



References





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