inspect: Fix isgenerator logic.

dpgeorge · dpgeorge · commit 48bf3a74a859 · 2025-04-14T10:26:38.000+10:00
Also optimise both `isgenerator()` and `isgeneratorfunction()` so they use the same lambda, and don't have to create it each time they are called. Fixes issue #997. Signed-off-by: Damien George <damien@micropython.org>
diff --git a/python-stdlib/inspect/inspect.py b/python-stdlib/inspect/inspect.py
@@ -1,5 +1,7 @@
 import sys
 
+_g = lambda: (yield)
+
 
 def getmembers(obj, pred=None):
     res = []
@@ -16,11 +18,11 @@ def isfunction(obj):
 
 
 def isgeneratorfunction(obj):
-    return isinstance(obj, type(lambda: (yield)))
+    return isinstance(obj, type(_g))
 
 
 def isgenerator(obj):
-    return isinstance(obj, type(lambda: (yield)()))
+    return isinstance(obj, type((_g)()))
 
 
 class _Class:
