How to add pre-save processing when adding objects on the Django admin site

from django.db import models


class Word(models.Model):
    """Word model"""

    word = models.CharField(max_length=15, unique=True)
    #Character field
    word_count = models.PositiveSmallIntegerField(blank=True, null=True)

    def __str__(self):
        return self.word

from django.contrib import admin

from .models import Word


class WordAdmin(admin.ModelAdmin):

    # save_Override model function
    def save_model(self, request, obj, form, change):
        word = obj.word  #Input value in word field

        # word_count
        word_count = len(word)

        obj.word_count = word_count
        obj.save()  #Save object


#Model and save_Specify model function
admin.site.register(Word, WordAdmin)

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