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#5310, #3558: fix operator precedence table.

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Georg Brandl 2009-02-19 08:30:06 +00:00
parent 749e6d0a01
commit e7cb1ce895
1 changed files with 18 additions and 28 deletions
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Doc/reference/expressions.rst
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@ -816,14 +816,14 @@ Raising a negative number to a fractional power results in a :exc:`ValueError`.
.. _unary:
Unary arithmetic operations
===========================
Unary arithmetic and bitwise operations
=======================================
.. index::
triple: unary; arithmetic; operation
triple: unary; bitwise; operation
All unary arithmetic (and bitwise) operations have the same priority:
All unary arithmetic and bitwise operations have the same priority:
.. productionlist::
u_expr: `power` | "-" `u_expr` | "+" `u_expr` | "~" `u_expr`
@ -1276,12 +1276,9 @@ groups from right to left).
+-----------------------------------------------+-------------------------------------+
| :keyword:`not` *x* | Boolean NOT |
+-----------------------------------------------+-------------------------------------+
| :keyword:`in`, :keyword:`not` :keyword:`in` | Membership tests |
+-----------------------------------------------+-------------------------------------+
| :keyword:`is`, :keyword:`is not` | Identity tests |
+-----------------------------------------------+-------------------------------------+
| ``<``, ``<=``, ``>``, ``>=``, ``<>``, ``!=``, | Comparisons |
| ``==`` | |
| :keyword:`in`, :keyword:`not` :keyword:`in`, | Comparisons, including membership |
| :keyword:`is`, :keyword:`is not`, ``<``, | tests and identity tests, |
| ``<=``, ``>``, ``>=``, ``<>``, ``!=``, ``==`` | |
+-----------------------------------------------+-------------------------------------+
| ``|`` | Bitwise OR |
+-----------------------------------------------+-------------------------------------+
@ -1293,29 +1290,19 @@ groups from right to left).
+-----------------------------------------------+-------------------------------------+
| ``+``, ``-`` | Addition and subtraction |
+-----------------------------------------------+-------------------------------------+
| ``*``, ``/``, ``%`` | Multiplication, division, remainder |
| ``*``, ``/``, ``//``, ``%`` | Multiplication, division, remainder |
+-----------------------------------------------+-------------------------------------+
| ``+x``, ``-x`` | Positive, negative |
| ``+x``, ``-x``, ``~x`` | Positive, negative, bitwise NOT |
+-----------------------------------------------+-------------------------------------+
| ``~x`` | Bitwise not |
| ``**`` | Exponentiation [#]_ |
+-----------------------------------------------+-------------------------------------+
| ``**`` | Exponentiation |
| ``x[index]``, ``x[index:index]``, | Subscription, slicing, |
| ``x(arguments...)``, ``x.attribute`` | call, attribute reference |
+-----------------------------------------------+-------------------------------------+
| ``x[index]`` | Subscription |
+-----------------------------------------------+-------------------------------------+
| ``x[index:index]`` | Slicing |
+-----------------------------------------------+-------------------------------------+
| ``x(arguments...)`` | Call |
+-----------------------------------------------+-------------------------------------+
| ``x.attribute`` | Attribute reference |
+-----------------------------------------------+-------------------------------------+
| ``(expressions...)`` | Binding or tuple display |
+-----------------------------------------------+-------------------------------------+
| ``[expressions...]`` | List display |
+-----------------------------------------------+-------------------------------------+
| ``{key:datum...}`` | Dictionary display |
+-----------------------------------------------+-------------------------------------+
| ```expressions...``` | String conversion |
| ``(expressions...)``, | Binding or tuple display, |
| ``[expressions...]``, | list display, |
| ``{key:datum...}``, | dictionary display, |
| ```expressions...``` | string conversion |
+-----------------------------------------------+-------------------------------------+
.. rubric:: Footnotes
@ -1358,3 +1345,6 @@ groups from right to left).
descriptors, you may notice seemingly unusual behaviour in certain uses of
the :keyword:`is` operator, like those involving comparisons between instance
methods, or constants. Check their documentation for more info.
.. [#] The power operator ``**`` binds less tightly than an arithmetic or
bitwise unary operator on its right, that is, ``2**-1`` is ``0.5``.