modulegraph: implement 'yield from'

PyInstaller/lib/modulegraph/util.py

@@ -136,16 +136,12 @@ def iterate_instructions(code_object):
     Yields `dis.Instruction`. After each code-block (`co_code`), `None` is
     yielded to mark the end of the block and to interrupt the steam.
     """
-    # TODO: Implement "yield from" for python 3
-
-    for instruction in get_instructions(code_object):
-        yield instruction
+    yield from get_instructions(code_object)
 
     yield None
 
     # For each constant in this code object that is itself a code object,
     # parse this constant in the same manner.
     for constant in code_object.co_consts:
         if inspect.iscode(constant):
-            for instruction in iterate_instructions(constant):
-                yield instruction
+            yield from iterate_instructions(constant)