How can I map dates in python using lambdas? I am trying to do this to print Excel sheet in Odoo

Question

I am trying to map keys for Excel sheet using lambdas. But I can't map properly. Please help

def _get_lines(self,cr,uid,ids,val, context=None):
    dict_dat = val
    od_start = dict_dat['od_start'][0]
    qry= ''
    x = 'hr_payslip.date_from = '+ date(od_start)
    print x
    qry = x
    qry_data = []
    qry = self.make_qry(cr,uid,ids,context=context)
    keys = self.get_keys()
    cr.execute(qry)
    qry_data = cr.fetchall()
    der_data = map(lambda x:dict(zip(keys,x)),qry_data)
    print der_data
    return der_data

Answer 1

x = 'hr_payslip.date_from = '+ str(val.get('od_start')) 

Solved the problem