how to do less than or equal to and greater than equal to in django filter?

Why don't you use the _range function?

filter(gender='MALE', age__range=(10, 50))

See here: https://docs.djangoproject.com/en/1.7/ref/models/querysets/#range

Edit for new link: https://docs.djangoproject.com/en/3.0/ref/models/querysets/#range

If you really want to use >= and <= yo could write:

Modelname.objects.filter(gender='MALE', age__gte = 10, age__lte = 50).count()

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