Understanding python decorators through flask.

Flask_decorator.py

# use the app.route with syntactic sugar 
from flask import Flask

app = Flask(__name__)

@app.route('/<string:name>')
def hello(name):
    return f"Hello {name}"
  
if __name__ == '__main__':
    app.run(debug=True)

Flask_decorator1.py

# use the app.route decorator without syntactic sugar
from flask import Flask

app = Flask(__name__)

wrapper = app.route('/<int:num>') # return wrapper function from decorator

# define decorated function
def numero(num):
    return f"Number {num}"

wrapper(numero)  

if __name__ == '__main__':
    app.run(debug=True)

Flask_decorator2.py

# Define view function as a lambda function
from flask import Flask

app = Flask(__name__)

decora = app.route('/anon/<int:num>') # return wrapper function from decorator

anom = lambda num : f"Anonymous view {num}" # create lambda view function

decora(anom)

if __name__ == '__main__':
    app.run(debug=True)

Flask_decorator3.py

# Define your own decorator 
from flask import Flask

app = Flask(__name__)

# decorator function
def my_route(rule, **options):
    # wrapper function
    def wrapper(f):
        endpoint = options.pop("endpoint", None)
        app.add_url_rule(rule, endpoint, f, **options)
        return f

    return wrapper


@my_route('/hi')
def hi():
    return "<h1> HI </h1>"

if __name__ == '__main__':
    app.run(debug=True)