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Table Of Content

• Table Of Content
  • Preparation
    • BTP Account
    • Tools
  • Development
  • Test(local)
  • Deployment
  • Test(BTP subaccount)
  • Refrence

Preparation

BTP Account

Use this link to apply and setup the BTP trial or enterpise enviroment

Tools

Python

Option1:

Install and setup from python offical website

Option2:

Install and setup from python-guide

IDE

we can use the VSC as you favourite development IDE, or other IDE you like.

• VSC Install the python extension

Development

Steps:

1. download the dependency , vitualenv and flask

   pip install virtualenv
   pip install Flask
   

2. create the project folder and Initializa vitual enviroment

      mkdir demo
      cd demo
      virtualenv flask
   

3. add file app.py with the below simple python code

   

   python code :

   from flask import Flask
   import os
   app = Flask(__name__)
   
   cf_port = os.getenv("PORT")
   
   @app.route('/')
   def hello_world():
      return 'Hello this is the BTP python demo!'
   
   if __name__ == '__main__':
     if cf_port is None:
      app.run(host='0.0.0.0', port=5000, debug=True)
   else:
      app.run(host='0.0.0.0', port=int(cf_port), debug=True)

Test(local)

1. Run python project via command line python app.py

2. Test with the link mentioned inthe command line

3. after you get the below response , your python applicaiton is runtime fine

 Hello this is the BTP python demo!

Deployment

Deploy for BTP:

1. set cloud foundry endpoint via command :

   cf api {EndpointURL}

   EndpointURL you can find in your subaccount :

2. login to your BTP endpoint with your btp user and password

   command :

   cf login

3. add manifest.yml for CF BTP development

   

4. configure the route and python buildpacks

   1. Before config the python buildpack , we need to add 3 files(runtime.text, requirement.txt procfile ) according to guide

      runtimetime.text: used to defined the python runtime version， we can find the right python runtime releaes via the pythonBuildPackage Relaese

      example code :

      3.8.10
      

      requirement.txt :used to give the python applicaiton denpendency

      example code :

      Flask==2.0.1
      

      procfile: define the python applicaiton start comand

      example code :

      web: python app.py
      

   2. confgure the routes here we suggest use bellow format as recomendation :

         {subdomain}-{appname}.{cfappdoman}
      

      subdomain:

      

      appname: defined by business

      cfappsdomain: user the command cf domains to get the domain url

      

      Example:

      ---
      applications:
      - name: pyApp
      memory: 128MB
      buildpacks: 
         - python_buildpack
      routes: 
         - route: 91ccc175trial-pythonapp.cfapps.ap21.hana.ondemand.com 
      

5. Deploy your nodjs project to your BTP Subaccount

   command :

   cf push

Test(BTP subaccount)

1. Navigte to your space

2. Go you applcation

3. Get applicaiton URL

4. Test it with the URL

   {applicaitonURL}/#/
   

   after you get the below response , your python applicaiton is runtime fine

   Hello this is the BTP python demo!
   

Refrence

Create and deploy python app: btp-pyton-deploy

Flask guide : flask Guide