code: def margin_to_exchange(self, symbol, currency, amount):
          
          params = {'symbol': symbol, 'currency': currency, 'amount': amount}
  
          path = '/v1/dw/transfer-out/margin'
  
          def _wrapper(_func):
              @wraps(_func)
              def handle():
                  _func(api_key_post(params, path))
  
              return handle
  
          return _wrapper
docs: 借贷账户划出至现货账户
          :param amount:
          :param currency:
          :param symbol:
          :return: