interface.py

from flask_wtf import FlaskForm
from wtforms import IntegerField, DecimalField, SubmitField
from wtforms.validators import DataRequired, NumberRange, optional

minn, maxx = 0, 1000

class GA_Interface(FlaskForm):
    weight1 = IntegerField('Weights', validators=[DataRequired(), NumberRange(min=1, max=maxx)])
    weight2 = weight3 = weight4 = IntegerField('Weights', validators=[optional(), NumberRange(min=minn, max=maxx)])
    
    value1 = IntegerField('Values (Profit)', validators=[DataRequired(),NumberRange(min=1, max=maxx)])
    value2 = value3 = value4 = IntegerField('Values (Profit)', validators=[optional(), NumberRange(min=minn, max=maxx)])

    knapsack_value      = IntegerField('Knapsack Value', validators=[DataRequired(), NumberRange(min=1, max=maxx)])
    generation_count    = IntegerField('Net Generations', validators=[optional(), NumberRange(min=1, max=maxx)])
    gene_count          = IntegerField('Chromosome Length', validators=[optional(), NumberRange(min=2, max=maxx)])
    mutation_rate       = DecimalField('Mutation Rate', validators=[optional(), NumberRange(min=0.001, max=1.0)])
    crossover_rate      = DecimalField('Crossover Rate', validators=[optional(), NumberRange(min=0.001, max=1.0)])
    submit              = SubmitField('Get Results')