when I create below code geeting error 
AttributeError: 'bool' object has no attribute 'get

class ResPartner(models.Model):

    _inherit='res.partner'

    @api.onchange('email')
    def onchange_email(self):
        if self.email:
            if re.match(r"^[A-Za-z0-9\.\+_-]+@[A-Za-z0-9\._-]+\.[a-zA-Z]*$", self.email)!=None:
               return True
            else:
                raise UserError(_('Please Enter a Valid Email Address! \n Thank You!'))
        else:
            return True

     if re.match("^(((\+?\(971\))|0|((00|\+)?971))-?)?[7-9]\d{9}$", self.mobile) != None:

    return True
else:
     raise UserError(_('Please Enter a Valid Mobile Number! \n Thank You!'))