python - Change initial form field value in views (Django) -

i have 3 form fields want modify/change value of in views - function one_labeling() before posting form in template. first field label, want change initial value in views. secondly have 2 choice fields, pos_tag , head_tags use set_head_tags , set_post_tags in views multiplechoicefields post_tags , head_tags in forms in order post value of each selected field instead of number, e.g "nn" instead of 1. @ moment value "nn" key 1 pos_tags in forms wonder if set , modify initial variable in views field pos_tags , head_tags field label.

in forms.py  class labelingform(forms.modelform):      label = forms.charfield(widget=forms.hiddeninput(), initial="trytrytry22",required=false)        pos_nodes = (('1','nn'),            ('2','poss'),           ....          ) pos_tags = forms.multiplechoicefield(choices=pos_nodes, required=false)    head_node_choices = (('1','np'),            ('2','vp'),           ...           )   head_tags = forms.multiplechoicefield(choices=head_node_choices,required=false)   class meta:         model = onelabeling         fields = ('label', 'sentence' )       def set_head_tags(self, head_tags):         data = self.data.copy()         data['head_tags'] = head_tags         self.data = data      def set_pos_tags(self, pos_tags):         data = self.data.copy()         data['pos_tags'] = pos_tags         self.data = data 

in views.py

def one_labeling(request, postid):                 form = labelingform(request.post)                  data1 =  form.cleaned_data['pos_tags']                 data2 =  form.cleaned_data['head_tags']                 if form.is_valid():                  if data1 , data2:                     l = data1[0]                     ll = data2[0]                     pos_tags = dict(form.fields['pos_tags'].choices)                     head_tags = dict(form.fields['head_tags'].choices)                     = pos_tags.get(l)                     j = head_tags.get(ll)                      form.set_head_tags(j)                     form.set_pos_tags(i)                       post_one_labeling(request, one_labeling) 

for giving initial values multiple choice fields, can try doing following :-

    pos_tags = forms.multiplechoicefield(choices=pos_nodes,                      initial=[pos_node[0] pos_node in pos_nodes])