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app.py

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from flask import Flask

from flask import request

import os

import math

app = Flask(__name__)

@app.route('/')

def hello():

default_num = 2

ns = request.args.get('num')

out = [

'<form>Number to find square root of: <input type=text name=num> <input type=submit></form>',

]

nb = None

if ns:

try:

nb = float(ns)

except ValueError:

out.append(f"<p>Bad number: <code>{ns}</code></p>")

if nb is None:

out.append(f"<p>No valid number entered; using <code>{default_num}</code> by default.</p>")

nb = default_num

match [ nb ]:

case [ number ]:

if number < 0:

out.append(f"<p>Can't find the square root of <code>{nb}</code> since it's negative</p>")

else:

out.append(f"<p>The square root of {ns} is: {math.sqrt(number)}</p>")

return '\n'.join(out) + '\n'

if __name__ == '__main__':

port = os.environ.get('FLASK_PORT') or 8080

port = int(port)

app.run(port=port,host='0.0.0.0')