code: def _where(self, **kwargs):
          '''use this to filter VLists with kv pairs'''
          out = self
          for k,v in kwargs.items():
              out = out.where(k, lambda i:i==v)
          return ouf _where(self, **kwargs):
          '''use this to filter VLists with kv pairs'''
          out = self
          for k,v in kwargs.items():
              out = out.where(k, lambda i:i==v)
          return out
docs: use this to filter VLists with kv pairs