BF: Return keys if maxWait <= 0

Author: ariekahn

psychopy/iohub/client/keyboard.py

@@ -394,7 +394,7 @@ def waitForKeys(self, maxWait=None, keys=None, chars=None, mods=None,
         Returned events are sorted by time.
 
         :param maxWait: Maximum seconds method waits for >=1 matching event.
-                        If 0.0, method functions the same as getKeys().
+                        If <=0.0, method functions the same as getKeys().
                         If None, the methods blocks indefinitely.
         :param keys: Include events where .key in keys.
         :param chars: Include events where .char in chars.
@@ -427,6 +427,11 @@ def pumpKeys():
             win32MessagePump()
             return key
 
+        # Don't wait if maxWait is <= 0
+        if maxWait <= 0:
+            key = pumpKeys()
+            return key
+
         while getTime() < (timeout - checkInterval * 2):
             # Pump events on pyglet windows if they exist
             ltime = getTime()