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bpo-43755: Update docs to reflect that lambda is not allowed in comp_if
since 3.9 (GH-25231)
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@ -185,7 +185,7 @@ Common syntax elements for comprehensions are:
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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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comp_if: "if" `or_test` [`comp_iter`]
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The comprehension consists of a single expression followed by at least one
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:keyword:`!for` clause and zero or more :keyword:`!for` or :keyword:`!if` clauses.
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@ -1707,7 +1707,6 @@ Conditional expressions
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.. productionlist:: python-grammar
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conditional_expression: `or_test` ["if" `or_test` "else" `expression`]
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expression: `conditional_expression` | `lambda_expr`
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expression_nocond: `or_test` | `lambda_expr_nocond`
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Conditional expressions (sometimes called a "ternary operator") have the lowest
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priority of all Python operations.
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@ -1733,7 +1732,6 @@ Lambdas
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.. productionlist:: python-grammar
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lambda_expr: "lambda" [`parameter_list`] ":" `expression`
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lambda_expr_nocond: "lambda" [`parameter_list`] ":" `expression_nocond`
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Lambda expressions (sometimes called lambda forms) are used to create anonymous
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functions. The expression ``lambda parameters: expression`` yields a function
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@ -267,6 +267,10 @@ Other Language Changes
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:func:`~operator.countOf` of the :mod:`operator` module.
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(Contributed by Serhiy Storchaka in :issue:`40824`.)
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* Unparenthesized lambda expressions can no longer be the expression part in an
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``if`` clause in comprehensions and generator expressions. See :issue:`41848`
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and :issue:`43755` for details.
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New Modules
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===========
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@ -0,0 +1,3 @@
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Update documentation to reflect that unparenthesized lambda expressions can
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no longer be the expression part in an ``if`` clause in comprehensions and
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generator expressions since Python 3.9.
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