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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def save(self, commit=True):
        ''' If the staff member is an instructor, also update the availableForPrivates field on the Instructor record. '''
        if getattr(self.instance,'instructor',None):
            self.instance.instructor.availableForPrivates = self.cleaned_data.pop('availableForPrivates',self.instance.instructor.availableForPrivates)
            self.instance.instructor.save(update_fields=['availableForPrivates',])
        super(StaffMemberBioChangeForm,self).save(commit=True)