Password Widget and Password Hashing in Django Admin

I am new in Python coding and now trying to learn Django. Right now i am using django 1.11.3 version. So i have learned the basic thing in Django and created an app.

In my app, i have created a student model which include an password field. What i have noticed is, in Admin module password field is stored in simple text. So i need help to hash the password field in admin module. I need md5 hashing.

So can u guys help me. Is there any method to solve this?

This is what i have tried.

My Model

class student(models.Model):
    name = models.CharField(max_length=100)
    age = models.CharField(max_length=2)
    dob = models.DateField()
    father_name = models.CharField(max_length=100)
    username = models.CharField(max_length=25,null=True)
    password = models.CharField(max_length=100,null=True)
    def __unicode__(self):
        return self.name

My Admin

from django.contrib import admin
from django import forms
from .models import student

admin.site.register(student)

class studentAdmin(admin.ModelAdmin):
    formfield_overrides = {
        student.password: {'widget': forms.PasswordInput},
        }