diff --git a/doc/tutorial/machine_learning_map/pyparsing.py b/doc/tutorial/machine_learning_map/pyparsing.py
index a0f4a66c7291e..0418cf2b51528 100644
--- a/doc/tutorial/machine_learning_map/pyparsing.py
+++ b/doc/tutorial/machine_learning_map/pyparsing.py
@@ -3842,7 +3842,7 @@ def parseImpl( self, instring, loc, doActions=True ):
             try_not_ender(instring, loc)
         loc, tokens = self_expr_parse( instring, loc, doActions, callPreParse=False )
         try:
-            hasIgnoreExprs = (not not self.ignoreExprs)
+            hasIgnoreExprs = bool(self.ignoreExprs)
             while 1:
                 if check_ender:
                     try_not_ender(instring, loc)