Rename .py to .pyi.

3/_tracemalloc.pyi

@@ -0,0 +1,26 @@
+"""Stub file for the '_tracemalloc' module."""
+# This is an autogenerated file. It serves as a starting point
+# for a more precise manual annotation of this module.
+# Feel free to edit the source below, but remove this header when you do.
+
+from typing import List, Tuple, Dict, Undefined, GenericType
+
+def _get_object_traceback(*args, **kwargs) -> object: ...
+
+def _get_traces() -> object:
+    raise MemoryError()
+
+def clear_traces() -> None: ...
+
+def get_traceback_limit() -> long: ...
+
+def get_traced_memory() -> tuple: ...
+
+def get_tracemalloc_memory() -> object: ...
+
+def is_tracing() -> bool: ...
+
+def start(*args, **kwargs) -> None:
+    raise ValueError()
+
+def stop() -> None: ...