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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')