""" Demonstration of making simple APIs with Flask MCS 260 Fall 2020 Lecture 35 """ import flask import random # Create a new Flask application that will listen for # HTTP requests. app = flask.Flask("Erlenmeyer") # Make it so that this function is called # when HTTP request "GET /" is received @app.route("/") def hello(): """ Return a simple HTML document displaying "Hello World" """ return "

Hello World

" @app.route("/forbidden") def beans(): """ Return 403 status code and a message """ return "That's not allowed", 403 @app.route("/tea") def short_stout(): """ Return 418 I'm a Teapot """ return "I am short and stout", 418 metal_data = [ { "name": "copper", "atomic_number": 29, "ferromagnetic": False }, { "name": "aluminium", "atomic_number": 13, "ferromagnetic": False }, { "name": "gold", "atomic_number": 79, "ferromagnetic": False }, { "name": "iron", "atomic_number": 26, "ferromagnetic": True }, { "name": "nickel", "atomic_number": 28, "ferromagnetic": True }, ] @app.route("/metal/random") def thats_so_metal(): """Choose a metal at random and return as JSON""" # Select one of the metals at random m = random.choice(metal_data) return flask.jsonify(m) appledata = [ { "name": "McIntosh", "stars": 5 }, { "name": "Honeycrisp", "stars": 3 }, { "name": "Red Delicious", "stars": -10 }, ] @app.route("/apple/random") def stanley(): """Choose an apple variety and return JSON data about it""" # Select one item from appledata, at random a = random.choice(appledata) # Return the object a as a JSON HTTP reply return flask.jsonify(a) # This function call is not expected to return # because it starts the main loop that waits for # incoming HTTP requests app.run(port=3000) # 127.0.0.1 is an IP address that always refers to # the localhost, using the loopback network interface