I can't figure out the django qeryset for retriving a value from a field by a condition

HI, 

My model like this 

 

        mobile_name = models.CharField("Mobile Name", max_length=50)
opinion = models.CharField('Comments', max_length=2000)
total = models.FloatField('Total Mark')

the sql qery should like this "SELECT total FROM tablexyz WHERE mobile_name=xyz"

Thanks in advance

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