if images are not clear please click on image to zoom
- Run Flask Hello world application
- Add Debug mod to Flask application
- Change Flask Route
- Change Host and Port
Run Flask Hello world application
first open pycharm and goto File and new project then select flask from the menu and give a name and folder to save file.
then it will automatically created the hello world program for you
then right click and select run.or you can use alt+shift+f10
then it will give massage it will run on 127.0.0.1:5000
this is run on local host port 5000
so lets type 127.0.0.1:5000 in web browser.
it give a result like this
so you get hello world in Flask.
ok now take a look at the code
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'Hello World!'
if __name__ == '__main__':
app.run()
from flask import Flask
this means we get only Flask module from flask package.
otherwise we can import Flask it will import the all the modules inside the flask package.
app = Flask(__name__)
this means this python program run as flask app named app you can use app or application or whatever name you like
@app.route('/')
This is route this point the function to return value .this is root value that meansif you type 127.0.0.1:5000 this will return Hello World as return
def hello_world():
return 'Hello World!'
this is python functionyou have to careful to maintain intendant otherwise it will not execute.maintain the suitable spaces.
if __name__ == '__main__':
app.run()
this means run the main function
Add Debug mod to Flask
when you add debug mod you can run application continuously when the code is changed.app.debug=True
Change Host and Port in Python Flask
you can change change host and port in a Flask app usinghost='your IP or host name',port=port number
if __name__ == '__main__':
app.run(host='127.10.20.30',port=8080)
Change Route in Flask
route is the pointing point to the python flask function.when you route it will point the relevant function and it will return the output of the function.
@app.route('/')
now we create new function called sayhi().to print hello sameera
@app.route('/sayhi')
def say_hi():
return 'welcome sameera ! :) '
so we are going through the 127.10.20.30:5000/sayhi
this will give the output welcome sameera ! :) in web browser
Hope you enjoy tutorial.see you in next lesson
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