Avoid invoking the parser/compiler just to test the presence of a function.

diff --git a/Lib/os.py b/Lib/os.py
index abbadc41e44b0a44d09f04504f8554655fe3f36b..40d117e824f707c49fd0572667f3ea0e82ba0049 100644 (file)
--- a/Lib/os.py
+++ b/Lib/os.py
@@ -514,11 +514,7 @@ def getenv(key, default=None):
 __all__.append("getenv")
 
 def _exists(name):
-    try:
-        eval(name)
-        return True
-    except NameError:
-        return False
+    return name in globals()
 
 # Supply spawn*() (probably only for Unix)
 if _exists("fork") and not _exists("spawnv") and _exists("execv"):