Flask is a small and lightweight Python web framework that provides useful tools and features that make creating web applications in Python easier. It gives developers flexibility and is a more accessible framework for new developers since you can build a web application quickly using only a single Python file
To install Flask by using
- pip install Flask
Example
Output
The above given Python script is executed from Pycharm Terminal
- python Example_flask.py
A message in Python shell informs you that
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)Open the above URL (localhost:5000) in the browser. ‘Hello World’ message will be displayed on it.
Flask constructor takes the name of current module (__name__) as argument.
The route() function of the Flask class is a decorator, which tells the application which URL should call the associated function.