fix(python): default_bytes_stream_chunk_size is respected even if req…

…uest options is not passed in (#4972)

generators/python/sdk/versions.yml

@@ -1,4 +1,11 @@
 # For unreleased changes, use unreleased.yml
+- version: 4.3.2
+  irVersion: 53
+  changelogEntry:
+    - type: fix
+      summary: |
+        The generator will now correctly default to the configured global `default_bytes_stream_chunk_size` when the `request_options` parameter is not provided.
+
 - version: 4.3.1
   irVersion: 53
   changelogEntry:

generators/python/src/fern_python/generators/sdk/client_generator/endpoint_response_code_writer.py

@@ -239,9 +239,10 @@ def _handle_success_text(
 
     def _handle_success_file_download(self, *, writer: AST.NodeWriter) -> None:
         maybe_chunk_size_default = self._context.custom_config.default_bytes_stream_chunk_size
+        defaulted_chunk_size_default = maybe_chunk_size_default if maybe_chunk_size_default is not None else "None"
         chunk_size_variable = "_chunk_size"
         writer.write_line(
-            f'{chunk_size_variable} = request_options.get("chunk_size", {maybe_chunk_size_default if maybe_chunk_size_default is not None else "None"}) if request_options is not None else None'
+            f'{chunk_size_variable} = request_options.get("chunk_size", {defaulted_chunk_size_default}) if request_options is not None else {defaulted_chunk_size_default}'
         )
         if self._is_async:
             writer.write("async ")