auth.py

from flask import Blueprint,render_template,request,flash

auth = Blueprint('auth',__name__)

@auth.route('/login',methods=['GET','POST'])
def login():
    data = request.form
    print(data.get('password'))
    return render_template('login.html',data_from_backend='testing data from backend')

@auth.route('/sign-up',methods=['GET','POST'])
def singin():
    if request.method == "POST":
        email = request.form.get('email')
        firstName = request.form.get('firstName')
        password1 = request.form.get('password1')
        password2 = request.form.get('password2')
        print(email,firstName,password1,password2)
        if len(email) < 9:
            flash("Email must be greater than 3 characters.",category='error')
            #flash is a built in function from flask 
        elif len(firstName) < 2:
            flash("Firstname must be greater than 1 characters.",category='error')
        elif password1 != password2:
            flash("Password don't match.",category='error')
        elif len(password1) < 7:
            flash("Password must be at least 7 characters.",category='error') 
        else:
            flash("Account created!",category='success')
    return render_template('sign_up.html')

@auth.route('/logout')
def logout():
    return "<h2>Logout</h2>"