Typo repair.
diff --git a/Doc/tut/tut.tex b/Doc/tut/tut.tex
index 9e705bc..c53ef06 100644
--- a/Doc/tut/tut.tex
+++ b/Doc/tut/tut.tex
@@ -5486,7 +5486,7 @@
floating-point arithmetic you'll see the result you expect in the end
if you simply round the display of your final results to the number of
decimal digits you expect. \function{str()} usually suffices, and for
-finer control see the discussion of Pythons's \code{\%} format
+finer control see the discussion of Python's \code{\%} format
operator: the \code{\%g}, \code{\%f} and \code{\%e} format codes
supply flexible and easy ways to round float results for display.