switch import order

rosidl_generator_cpp/rosidl_generator_cpp/__init__.py

@@ -12,8 +12,8 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from math import isnan
 from ast import literal_eval
+from math import isnan
 
 from rosidl_parser.definition import AbstractGenericString
 from rosidl_parser.definition import AbstractNestedType