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Doc/reference/expressions.rst
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@ -2034,18 +2034,35 @@ Evaluation order
.. index:: pair: evaluation; order .. index:: pair: evaluation; order
Python evaluates expressions from left to right. Notice that while evaluating Python evaluates expressions from left to right (except for conditional_expression).
an assignment, the right-hand side is evaluated before the left-hand side. Notice that while evaluating an assignment, the right-hand side is evaluated before
the left-hand side.
Examples for left to right:
.. code-block:: python
2 + 3 * 4 / 2 - 1
7
Following is an example of right to left conditional_expression evaluation example:
.. code-block:: python
'foo' if 1 else 'bar' if 0 else 'baz'
'foo'
In the following lines, expressions will be evaluated in the arithmetic order of In the following lines, expressions will be evaluated in the arithmetic order of
their suffixes:: their suffixes:
expr1, expr2, expr3, expr4 .. code-block:: python
(expr1, expr2, expr3, expr4)
{expr1: expr2, expr3: expr4} expr1, expr2, expr3, expr4
expr1 + expr2 * (expr3 - expr4) (expr1, expr2, expr3, expr4)
expr1(expr2, expr3, *expr4, **expr5) {expr1: expr2, expr3: expr4}
expr3, expr4 = expr1, expr2 expr1 + expr2 * (expr3 - expr4)
expr1(expr2, expr3, *expr4, **expr5)
expr3, expr4 = expr1, expr2
.. _operator-summary: .. _operator-summary:
@ -2059,8 +2076,11 @@ Operator precedence
The following table summarizes the operator precedence in Python, from highest The following table summarizes the operator precedence in Python, from highest
precedence (most binding) to lowest precedence (least 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 and conditional expressions, which group from right to left). comparisons, including tests, exponentiation and conditional expressions, which
group from right to left which all have the same precedence and chain from left
to right — see section Comparisons — and exponentiation, which groups from right
to left)
Note that comparisons, membership tests, and identity tests, all have the same Note that comparisons, membership tests, and identity tests, all have the same
precedence and have a left-to-right chaining feature as described in the precedence and have a left-to-right chaining feature as described in the