code: def pnlSingle(
              self, account: str = '', modelCode: str = '',
              conId: int = 0) -> List[PnLSingle]:
          
          return [v for v in self.wrapper.pnlSingles.values() if
                  (not account or v.account == account) and
                  (not modelCode or v.modelCode == modelCode) and
                  (not conId or v.conId == conId)]
docs: List of subscribed :class:`.PnLSingle` objects (profit and loss for
          single positions).
  
          The :class:`.PnLSingle` objects are kept live updated.
  
          Args:
              account: If specified, filter for this account name.
              modelCode: If specified, filter for this account model.
              conId: If specified, filter for this contract ID.