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from flask import Flask, render_template, request, escape
app = Flask(__name__)
@app.route('/submit', methods=['POST'])
def submit_form():
username = request.form.get('username') #gets the input from the form
if not username or not username.isalnum(): #checks if the input is empty or contains
return "Invalid Username" #characters that arent letters or numbers
safe_username = escape(username) #encodes the username for output
return render_template('result.html', username=safe_username) #returns a template with a safe output
if __name__ == '__main__':