_columns = {

'credit': fields.integer( 'Credit', help='Project Credit'), 

'money': fields.integer( 'Money', help='Project Money'),  

}

def _calculate_rate(self, cr, uid, ids, money, context=None):

res = {}

for record in self.browse(cr, uid, ids, context=context):

res[record.id] = record.money * 100

return res

def on_change_credit_id(self, cr, uid, ids,money, context=None):

print ('-----------------------Credit--------------------')

res = {'value':{'credit': self._calculate_rate(self, cr, uid, ids, money,context=context),

} 

----------------> TypeError: _calculate_rate() got multiple values for keyword argument 'context'

Who can help me please