bpo-39868: Update Language Reference for PEP 572. (#18793)
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@ -90,8 +90,8 @@ The :keyword:`!if` statement
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The :keyword:`if` statement is used for conditional execution:
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.. productionlist::
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if_stmt: "if" `expression` ":" `suite`
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: ("elif" `expression` ":" `suite`)*
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if_stmt: "if" `assignment_expression` ":" `suite`
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: ("elif" `assignment_expression` ":" `suite`)*
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: ["else" ":" `suite`]
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It selects exactly one of the suites by evaluating the expressions one by one
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@ -116,7 +116,7 @@ The :keyword:`while` statement is used for repeated execution as long as an
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expression is true:
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.. productionlist::
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while_stmt: "while" `expression` ":" `suite`
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while_stmt: "while" `assignment_expression` ":" `suite`
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: ["else" ":" `suite`]
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This repeatedly tests the expression and, if it is true, executes the first
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@ -178,7 +178,7 @@ called "displays", each of them in two flavors:
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Common syntax elements for comprehensions are:
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.. productionlist::
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comprehension: `expression` `comp_for`
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comprehension: `assignment_expression` `comp_for`
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comp_for: ["async"] "for" `target_list` "in" `or_test` [`comp_iter`]
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comp_iter: `comp_for` | `comp_if`
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comp_if: "if" `expression_nocond` [`comp_iter`]
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@ -911,7 +911,8 @@ series of :term:`arguments <argument>`:
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: ["," `keywords_arguments`]
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: | `starred_and_keywords` ["," `keywords_arguments`]
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: | `keywords_arguments`
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positional_arguments: ["*"] `expression` ("," ["*"] `expression`)*
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positional_arguments: positional_item ("," positional_item)*
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positional_item: `assignment_expression` | "*" `expression`
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starred_and_keywords: ("*" `expression` | `keyword_item`)
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: ("," "*" `expression` | "," `keyword_item`)*
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keywords_arguments: (`keyword_item` | "**" `expression`)
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@ -1642,6 +1643,17 @@ returns a boolean value regardless of the type of its argument
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(for example, ``not 'foo'`` produces ``False`` rather than ``''``.)
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Assignment expressions
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======================
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.. productionlist::
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assignment_expression: [`identifier` ":="] `expression`
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.. TODO: BPO-39868
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See :pep:`572` for more details about assignment expressions.
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.. _if_expr:
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Conditional expressions
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@ -1711,7 +1723,7 @@ Expression lists
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expression_list: `expression` ("," `expression`)* [","]
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starred_list: `starred_item` ("," `starred_item`)* [","]
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starred_expression: `expression` | (`starred_item` ",")* [`starred_item`]
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starred_item: `expression` | "*" `or_expr`
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starred_item: `assignment_expression` | "*" `or_expr`
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.. index:: object: tuple
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@ -0,0 +1 @@
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Updated the Language Reference for :pep:`572`.
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