solution to "how to pass the parameter to a form during formset creation"

forms.py

import floppyforms.__future__ as forms
from .models import SendReceive, Player

from django.forms import inlineformset_factory, BaseFormSet, BaseInlineFormSet


class SRForm(forms.ModelForm):
    class Meta:
        model = SendReceive
        fields = ['amount_sent']

    def __init__(self, *args, **kwargs):
        super(SRForm, self).__init__(*args, **kwargs)
        curmax = int(kwargs['instance'].sender.participant.vars['herd_size'])
        self.fields['amount_sent'] = forms.IntegerField(label='How much to sent?',
                                                        required=True,
                                                        max_value=curmax,
                                                        min_value=0,
                                                        )





SRFormSet = inlineformset_factory(Player, SendReceive,
                                  fk_name='sender',
                                  can_delete=False,
                                  extra=0,
                                  form=SRForm,
                                  )