查询现金和持仓

        Arguments:
            accounts {[type]} -- [description]

        Returns:
            dict-- {'cash_available':xxx,'hold_available':xxx}

def query_positions(self, accounts):
        """查询现金和持仓

        Arguments:
            accounts {[type]} -- [description]

        Returns:
            dict-- {'cash_available':xxx,'hold_available':xxx}
        """
        try:
            data = self.call("positions", {'client': accounts})
            if data is not None:
                cash_part = data.get('subAccounts', {}).get('人民币', False)
                if cash_part:
                    cash_available = cash_part.get('可用金额', cash_part.get('可用'))

                position_part = data.get('dataTable', False)
                if position_part:
                    res = data.get('dataTable', False)
                    if res:
                        hold_headers = res['columns']
                        hold_headers = [
                            cn_en_compare[item] for item in hold_headers
                        ]
                        hold_available = pd.DataFrame(
                            res['rows'],
                            columns=hold_headers
                        )
                if len(hold_available) == 1 and hold_available.amount[0] in [
                        None,
                        '',
                        0
                ]:
                    hold_available = pd.DataFrame(
                        data=None,
                        columns=hold_headers
                    )
                return {
                    'cash_available':
                    cash_available,
                    'hold_available':
                    hold_available.assign(
                        amount=hold_available.amount.apply(float)
                    ).loc[:,
                          ['code',
                           'amount']].set_index('code').amount
                }
            else:
                print(data)
                return False, 'None ACCOUNT'
        except:
            return False