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bpo-43837: Reverse order of precedence table to show tightly binding operators first (GH-25469)

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Ammar Askar 2021-04-19 11:22:03 -04:00 • committed by GitHub
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Doc/reference/expressions.rst
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@ -1819,8 +1819,8 @@ Operator precedence
.. index:: .. index::
pair: operator; precedence pair: operator; precedence
The following table summarizes the operator precedence in Python, from lowest The following table summarizes the operator precedence in Python, from highest
precedence (least binding) to highest precedence (most binding). Operators in precedence (most binding) to lowest precedence (least binding). Operators in
the same box have the same precedence. Unless the syntax is explicitly given, the same box have the same precedence. Unless the syntax is explicitly given,
operators are binary. Operators in the same box group left to right (except for operators are binary. Operators in the same box group left to right (except for
exponentiation, which groups from right to left). exponentiation, which groups from right to left).
@ -1833,51 +1833,51 @@ precedence and have a left-to-right chaining feature as described in the
+-----------------------------------------------+-------------------------------------+ +-----------------------------------------------+-------------------------------------+
| Operator | Description | | Operator | Description |
+===============================================+=====================================+ +===============================================+=====================================+
| ``:=`` | Assignment expression |
+-----------------------------------------------+-------------------------------------+
| :keyword:`lambda` | Lambda expression |
+-----------------------------------------------+-------------------------------------+
| :keyword:`if <if_expr>` -- :keyword:`!else` | Conditional expression |
+-----------------------------------------------+-------------------------------------+
| :keyword:`or` | Boolean OR |
+-----------------------------------------------+-------------------------------------+
| :keyword:`and` | Boolean AND |
+-----------------------------------------------+-------------------------------------+
| :keyword:`not` ``x`` | Boolean NOT |
+-----------------------------------------------+-------------------------------------+
| :keyword:`in`, :keyword:`not in`, | Comparisons, including membership |
| :keyword:`is`, :keyword:`is not`, ``<``, | tests and identity tests |
| ``<=``, ``>``, ``>=``, ``!=``, ``==`` | |
+-----------------------------------------------+-------------------------------------+
| ``|`` | Bitwise OR |
+-----------------------------------------------+-------------------------------------+
| ``^`` | Bitwise XOR |
+-----------------------------------------------+-------------------------------------+
| ``&`` | Bitwise AND |
+-----------------------------------------------+-------------------------------------+
| ``<<``, ``>>`` | Shifts |
+-----------------------------------------------+-------------------------------------+
| ``+``, ``-`` | Addition and subtraction |
+-----------------------------------------------+-------------------------------------+
| ``*``, ``@``, ``/``, ``//``, ``%`` | Multiplication, matrix |
| | multiplication, division, floor |
| | division, remainder [#]_ |
+-----------------------------------------------+-------------------------------------+
| ``+x``, ``-x``, ``~x`` | Positive, negative, bitwise NOT |
+-----------------------------------------------+-------------------------------------+
| ``**`` | Exponentiation [#]_ |
+-----------------------------------------------+-------------------------------------+
| :keyword:`await` ``x`` | Await expression |
+-----------------------------------------------+-------------------------------------+
| ``x[index]``, ``x[index:index]``, | Subscription, slicing, |
| ``x(arguments...)``, ``x.attribute`` | call, attribute reference |
+-----------------------------------------------+-------------------------------------+
| ``(expressions...)``, | Binding or parenthesized | | ``(expressions...)``, | Binding or parenthesized |
| | expression, | | | expression, |
| ``[expressions...]``, | list display, | | ``[expressions...]``, | list display, |
| ``{key: value...}``, | dictionary display, | | ``{key: value...}``, | dictionary display, |
| ``{expressions...}`` | set display | | ``{expressions...}`` | set display |
+-----------------------------------------------+-------------------------------------+ +-----------------------------------------------+-------------------------------------+
| ``x[index]``, ``x[index:index]``, | Subscription, slicing, |
| ``x(arguments...)``, ``x.attribute`` | call, attribute reference |
+-----------------------------------------------+-------------------------------------+
| :keyword:`await` ``x`` | Await expression |
+-----------------------------------------------+-------------------------------------+
| ``**`` | Exponentiation [#]_ |
+-----------------------------------------------+-------------------------------------+
| ``+x``, ``-x``, ``~x`` | Positive, negative, bitwise NOT |
+-----------------------------------------------+-------------------------------------+
| ``*``, ``@``, ``/``, ``//``, ``%`` | Multiplication, matrix |
| | multiplication, division, floor |
| | division, remainder [#]_ |
+-----------------------------------------------+-------------------------------------+
| ``+``, ``-`` | Addition and subtraction |
+-----------------------------------------------+-------------------------------------+
| ``<<``, ``>>`` | Shifts |
+-----------------------------------------------+-------------------------------------+
| ``&`` | Bitwise AND |
+-----------------------------------------------+-------------------------------------+
| ``^`` | Bitwise XOR |
+-----------------------------------------------+-------------------------------------+
| ``|`` | Bitwise OR |
+-----------------------------------------------+-------------------------------------+
| :keyword:`in`, :keyword:`not in`, | Comparisons, including membership |
| :keyword:`is`, :keyword:`is not`, ``<``, | tests and identity tests |
| ``<=``, ``>``, ``>=``, ``!=``, ``==`` | |
+-----------------------------------------------+-------------------------------------+
| :keyword:`not` ``x`` | Boolean NOT |
+-----------------------------------------------+-------------------------------------+
| :keyword:`and` | Boolean AND |
+-----------------------------------------------+-------------------------------------+
| :keyword:`or` | Boolean OR |
+-----------------------------------------------+-------------------------------------+
| :keyword:`if <if_expr>` -- :keyword:`!else` | Conditional expression |
+-----------------------------------------------+-------------------------------------+
| :keyword:`lambda` | Lambda expression |
+-----------------------------------------------+-------------------------------------+
| ``:=`` | Assignment expression |
+-----------------------------------------------+-------------------------------------+
.. rubric:: Footnotes .. rubric:: Footnotes