API Programming with Python Flask

What Flask Provides out of box:

• Reciving HTTP requests
• Routing the HTTP requests to the controller
• Dispatching controller
• Returning the HTTP response

example 1:

# I am using 4 spaces for indent, and in few editor the tab don't looks good..
from flask import Flask, jsonify, request, Response

# jsonify class: For json.
# request class:
# Response class: to return proper status code. Its upper case.

# Need to explane the following line.
#
app = Flask(__name__)

### for route / ####

# The route and the function defination need to be in the same indent.
@app.route('/')
def hello():
    return "Hello World!"

# There should an indent after the if statement, to define the block of the if statement.
# Over here we are binding the app to host ip and to the port 5000.
if __name__ == '__main__':
    app.run(host='0.0.0.0',port=5000)

Note

Above is a quick sample code.

In this code the application will be listening to the host on port 5000.

example 2:

Note

In this example we have added another route called ‘/book’

# I am using 4 spaces for indent, and in few editor the tab don't looks good..
from flask import Flask, jsonify, request, Response

# jsonify class: For json.
# request class:
# Response class: to return proper status code. Its upper case.

# Need to explane the following line.
#
app = Flask(__name__)

### for route / ####

@app.route('/')
def hello():
    return "Hello World!"

### for route /book ###

@app.route('/books')
def welcome_to_book():
    return 'Welcome to the book api.'


if __name__ == '__main__':
    app.run(host='0.0.0.0',port=5000)

Note

Above is a quick sample code. In this code the application will be listening to the host on port 5000.