code: def queryTypesDescriptions(self, types):
          
          types = list(types)
          if types:
              types_descs = self.describeSObjects(types)
          else:
              types_descs = []
          return dict(map(lambda t, d: (t, d), types, types_descs))
docs: Given a list of types, construct a dictionary such that
          each key is a type, and each value is the corresponding sObject
          for that type.