message: [Python] [Codegen] Fixes nested structs with underscore names
  Fixes
diff: @@ -478,7 +478,7 @@ class PythonGenerator : public BaseGenerator {
  // a nested struct, prefix the name with the field name.
  auto subprefix = nameprefix;
  if (has_field_name) {
  - subprefix += NormalizedName(field) + fieldname_suffix;
  + subprefix += MakeLowerCamel(field) + fieldname_suffix;
  }
  StructBuilderArgs(*field.value.type.struct_def, subprefix, namesuffix,
  has_field_name, fieldname_suffix, code_ptr);
  @@ -518,7 +518,7 @@ class PythonGenerator : public BaseGenerator {
  indent + " builder.Pad(" + NumToString(field.padding) + ")\n";
  if (IsStruct(field_type)) {
  StructBuilderBody(*field_type.struct_def,
  - (nameprefix + (NormalizedName(field) + "_")).c_str(),
  + (nameprefix + (MakeLowerCamel(field) + "_")).c_str(),
  code_ptr, index, in_array);
  } else {
  const auto index_var = "_idx" + NumToString(index);
  @@ -531,7 +531,7 @@ class PythonGenerator : public BaseGenerator {
  if (IsStruct(type)) {
  StructBuilderBody(
  *field_type.struct_def,
  - (nameprefix + (NormalizedName(field) + "_")).c_str(), code_ptr,
  + (nameprefix + (MakeLowerCamel(field) + "_")).c_str(), code_ptr,
  index + 1, in_array);
  } else {
  code += IsArray(field_type) ? " " : "";
  