Flask basic python

Introduction:

Flask is a micro web framework written in python. It is well known as a lightweight framework for python web development because it is run on a stand-alone file whereas Django has multiple files for each operation such as URLs, views, and setting.

How to install flask using pip3

pip3 install flask

What you will learn from this post:what you:

• What is flask
• how to install flask
• static routes in flask
• dynamic routes in flask
• define function in flask

How to run this file

• open terminal/cmd type “python3 first_app.py”
• open “http://127.0.0.1/5000” (port may be vary)

# here I import flask library
from flask import Flask
app=Flask(__name__)



#this is stattic route ,here i set index function on my landing page
@app.route('/')
def index():
return "<h1>Hello ,this is a landing page</h1>"
#return method display this string in our landing page



#this is also static route, now i set "http://127.0.0.1:5000/about" to page function.
@app.route('/about')
def page():
return "<h1>This is about page</h1>"
# again return method display this string in our abour page



# here i used dynamic route (this type of route uses in page per user websites)
#<name> is dynamically change as per user input
#ttp://127.0.0.1:5000/user/rajat
@app.route('/user/<name>')
def users(name):
return "<h1>User name is : {}</h1>".format(name)
#here return display dynamic result with the help of string formating
if __name__=="__main__":
app.run(debug=True)
#app.run execute program and I enabled debug because this mode helps up catch errors.