title: How to set initial value of primary key in django
body: <p>I made this django model:</p>
  
  <pre><code>class Car(models.Model):
      car_id = models.AutoField(primary_key=True)
      engine_size = models.FloatField()
      fuel_consumption = models.FloatField()
  
      def __str__(self):
          return(str(self.car_id))
  </code></pre>
  
  <p>The automatic field generator in django always starts from 1.
  How do I make it generate id from initial value=100.
  For example, 100,101,102...</p>
  
  <p>Is there any built-in tool, or I just need to create a custom function for this?</p>