1 files changed, 5 insertions, 0 deletions
diff --git a/src/google/protobuf/compiler/python/python_generator.cc b/src/google/protobuf/compiler/python/python_generator.cc
index ca69fd4c..d301f015 100644
--- a/src/google/protobuf/compiler/python/python_generator.cc
+++ b/src/google/protobuf/compiler/python/python_generator.cc
@@ -319,6 +319,11 @@ void Generator::PrintTopLevelExtensions() const {
   const bool is_extension = true;
   for (int i = 0; i < file_->extension_count(); ++i) {
     const FieldDescriptor& extension_field = *file_->extension(i);
+    string constant_name = extension_field.name() + "_FIELD_NUMBER";
+    UpperString(&constant_name);
+    printer_->Print("$constant_name$ = $number$\n",
+      "constant_name", constant_name,
+      "number", SimpleItoa(extension_field.number()));
     printer_->Print("$name$ = ", "name", extension_field.name());
     PrintFieldDescriptor(extension_field, is_extension);
     printer_->Print("\n");