Django IntegerCSVField: Accepts a string such as "43,575,3,123,543". Any other characters are invalid

integercsvfield.py

from django import forms
from django.core.exceptions import ValidationError

from apps.merchant.models import Merchant
from views.form_fields import XEDateRangeField


class IntegerCSVField(forms.CharField):
    def __init__(self, min_value=None, max_value=None, *args, **kwargs):
        super().__init__(**kwargs)
        self.min_value = min_value
        self.max_value = max_value

    def clean(self, value):
        # check a valid list of integers separated by commas
        # nothing else is allowed
        try:
            values = [int(i) for i in value.split(',')]
        except:
            raise ValidationError('Non-integers found')

        # check in bounds
        if self.min_value:
            for i in values:
                if i < self.min_value:
                    raise ValidationError('Number below min_value found')

        if self.max_value:
            for i in values:
                if i > self.max_value:
                    raise ValidationError('Number above max_value found')

        # ok
        return values