Fixing bug

[#448679] Left to right

* Python/compile.c
  (com_dictmaker): Reordered evaluation of dictionaries to follow strict
  LTR evaluation.

* Lib/compiler/pycodegen.py
  (CodeGenerator.visitDict): Reordered evaluation of dictionaries to
  follow strict LTR evaluation.

* Doc/ref/ref5.tex
  Documented the general LTR evaluation order idea.

* Misc/NEWS
  Documented change in evaluation order of dictionaries.

1 files changed, 18 insertions, 0 deletions

diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index 34c99ef..c0212d0 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -1026,6 +1026,24 @@ tuple, but rather yields the value of that expression.
 \code{()}.)
 \indexii{trailing}{comma}
 
+\section{Evaluation order\label{evalorder}}
+\indexii{evaluation}{order}
+
+Python evaluates expressions from left to right. Notice that while
+evaluating an assignment, the right-hand side is evaluated before
+the left-hand side.
+
+In the following lines, expressions will be evaluated in the
+arithmetic order of their suffixes:
+
+\begin{verbatim}
+expr1, expr2, expr3, expr4
+(expr1, expr2, expr3, expr4)
+{expr1: expr2, expr3: expr4}
+expr1 + expr2 * (expr3 - expr4)
+func(expr1, expr2, *expr3, **expr4)
+expr3, expr4 = expr1, expr2
+\end{verbatim}
 
 \section{Summary\label{summary}}