Python style format error (#64)

* Python style format error

* Python style format error

Co-authored-by: Boyu Fang <[email protected]>

Author: bobfang1992

src/encoding_decoding.cpp

@@ -73,17 +73,8 @@ toml::array py_list_to_toml_array(const py::list &list) {
       toml::time time_value = it.cast<toml::time>();
       arr.push_back(time_value);
     } else {
-      std::stringstream ss;
-#ifdef PYPY_VERSION
-      // see
-      // https://github.com/conda-forge/pytomlpp-feedstock/pull/1#issuecomment-972738986
-      // and
-      // https://github.com/pybind/pybind11/issues/3408#issuecomment-972752210
-      ss << "not a valid type for conversion " << std::endl;
-#else
-      ss << "not a valid type for conversion " << it << std::endl;
-#endif
-      throw py::type_error(ss.str());
+      throw py::type_error(
+          py::str("not a valid type for conversion {}").format(it));
     }
   }
   return arr;