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 class FlowerForm(FlaskForm):
    cr_score = IntegerField('Credit Score', validators=[DataRequired()])
    geo = StringField('Geography', validators=[DataRequired()])
    gen = StringField('Gender', validators=[DataRequired()])
    age = IntegerField('Age', validators=[DataRequired()])
    ten = IntegerField('Tenure', validators=[DataRequired()])
    bal = IntegerField('Balance', validators=[DataRequired()])
    num = IntegerField('Number Of Products', validators=[DataRequired()])
    has_card = IntegerField('Has Credit Card', validators=[DataRequired()])
    is_active = IntegerField('Is Active Member', validators=[DataRequired()])
    sal = IntegerField('Estimated Salary', validators=[DataRequired()])
    
    submit = SubmitField('Analyze')

@app.route('/', methods=['GET', 'POST'])
def index():
    # Create instance of the form.
    form = FlowerForm(request.form)
    # If the form is valid on submission
    if request.method == "POST" and form.validate_on_submit():
   
        # Grab the data from the input on the form.
        session["cr_score"] = form.cr_score.data
        session["geo"] = form.geo.data
        session["gen"] = form.gen.data
        session["age"] = form.age.data
        session["ten"] = form.ten.data
        session["bal"] = form.bal.data
        session["num"] = form.num.data
        session["has_card"] = form.has_card.data
        session["is_active"] = form.is_active.data
        session["sal"] = form.sal.data
        
        return redirect(url_for("prediction"))
    print(form.errors)
    return render_template('home.html', form=form)

@app.route('/prediction')
def prediction():
    #Defining content dictionary
    content = {}
    
    content["CreditScore"] = int(session["cr_score"])
    content["Geography"] = str(session["geo"])
    content["Gender"] = str(session["gen"])
    content["Age"] = int(session["age"])
    content["Tenure"] = int(session["ten"])
    content["Balance"] = int(session["bal"])
    content["NumOfProducts"] = int(session["num"])
    content["HasCrCard"] = int(session["has_card"])
    content["IsActiveMember"] = int(session["is_active"])
    content["EstimatedSalary"] = int(session["sal"])


    results = return_prediction(model = model, scaler = scaler, onehot = ohencoder, lab_enc=labencoder, sample_json = content)
    return render_template('prediction.html',results=results)
 

Проверка формы, похоже, здесь не работает.
Я тоже пытался form.valid_on_submit .

Мой home.html досье и prediction.html файл, который есть у обоих form.hidden_tag() в нем.

Оператор if каким-то образом переопределяется, и я возвращаюсь на домашнюю страницу

HTML home.html -код:

 <h1>Welcome to Customer Retention Prediction</h1>
<h2>Please enter customer details below:</h2>
<form action = "/" method=”POST”>
 {# This hidden_tag is a CSRF security feature. #}
 {{form.hidden_tag()}}
 {{ form.csrf_token }}
 {{form.cr_score.label}} {{form.cr_score}}
 <br>
 {{form.geo.label}} {{form.geo}}
 <br>
 {{form.gen.label}} {{form.gen}}
 <br>
 {{form.age.label}} {{form.age}}
 <br>
 {{form.ten.label}} {{form.ten}}
 <br>
 {{form.bal.label}} {{form.bal}}
 <br>
 {{form.num.label}} {{form.num}}
 <br>
 {{form.has_card.label}}{{form.has_card}}
 <br>
 {{form.is_active.label}} {{form.is_active}}
 <br>
 {{form.sal.label}} {{form.sal}}
 <br>
 {{form.submit()}}
</form>
 

prediction.html код:

 <h1>Thank You.</h1>
 {# This hidden_tag is a CSRF security feature. #}
 {{form.hidden_tag()}}
<h2>Probability of this customer leaving the bank is: {{results}}</h2>
 

Вы пробовали печатать ошибку После попытки оператора if print(form.errors) , это должно привести к ошибке no crsf token .

В html добавьте это там, где вы использовали form.hidden_tag() ниже, используйте {{ form.csrf_token }}

 [...]
if request.method == "POST" and form.validate():
        # Grab the data from the input on the form.
        session["cr_score"] = form.cr_score.data
        session["geo"] = form.geo.data
        session["gen"] = form.gen.data
        session["age"] = form.age.data
        [....]
print(form.errors)
return render_template('home.html', form=form)
 

Изменить: вы не используете действие в теге формы.

В html-файле: это должно быть так

 <form action="/" method="POST">
 

ваша функция индекса будет:

 @app.route('/', methods=['GET', 'POST'])
def index():
    # Create instance of the form.
    form = FlowerForm(request.form)
    # If the form is valid on submission
    if request.method == "POST":
        print("yoyo")
        if form.validate_on_submit():
            
            # Grab the data from the input on the form.
            session["cr_score"] = form.cr_score.data
            session["geo"] = form.geo.data
            session["gen"] = form.gen.data
            session["age"] = form.age.data
            session["ten"] = form.ten.data
            session["bal"] = form.bal.data
            session["num"] = form.num.data
            session["has_card"] = form.has_card.data
            session["is_active"] = form.is_active.data
            session["sal"] = form.sal.data
            
            return redirect(url_for("prediction"))
    print(form.errors)
    return render_template('home.html', form=form)
 

Ваш home.html будет:

 <h1>Welcome to Customer Retention Prediction</h1>
<h2>Please enter customer details below:</h2>
<form action="/" method="POST">
 {# This hidden_tag is a CSRF security feature. #}
 {{form.hidden_tag()}}

 {{ form.csrf_token }}
 {{form.cr_score.label}} {{form.cr_score}}
 <br>
 {{form.geo.label}} {{form.geo}}
 <br>
 {{form.gen.label}} {{form.gen}}
 <br>
 {{form.age.label}} {{form.age}}
 <br>
 {{form.ten.label}} {{form.ten}}
 <br>
 {{form.bal.label}} {{form.bal}}
 <br>
 {{form.num.label}} {{form.num}}
 <br>
 {{form.has_card.label}}{{form.has_card}}
 <br>
 {{form.is_active.label}} {{form.is_active}}
 <br>
 {{form.sal.label}} {{form.sal}}
 <br>
 {{form.submit()}}
  {{form.errors}}
</form>