diff options
| -rw-r--r-- | Doc/reference/expressions.rst | 4 | ||||
| -rw-r--r-- | Doc/whatsnew/3.9.rst | 4 | ||||
| -rw-r--r-- | Misc/NEWS.d/next/Documentation/2021-04-06-14-55-45.bpo-43755.1m0fGq.rst | 3 |
3 files changed, 8 insertions, 3 deletions
diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index 9b1a395..e7b1d38 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -183,7 +183,7 @@ Common syntax elements for comprehensions are: comprehension: `assignment_expression` `comp_for` comp_for: ["async"] "for" `target_list` "in" `or_test` [`comp_iter`] comp_iter: `comp_for` | `comp_if` - comp_if: "if" `expression_nocond` [`comp_iter`] + comp_if: "if" `or_test` [`comp_iter`] The comprehension consists of a single expression followed by at least one :keyword:`!for` clause and zero or more :keyword:`!for` or :keyword:`!if` clauses. @@ -1695,7 +1695,6 @@ Conditional expressions .. productionlist:: python-grammar conditional_expression: `or_test` ["if" `or_test` "else" `expression`] expression: `conditional_expression` | `lambda_expr` - expression_nocond: `or_test` | `lambda_expr_nocond` Conditional expressions (sometimes called a "ternary operator") have the lowest priority of all Python operations. @@ -1721,7 +1720,6 @@ Lambdas .. productionlist:: python-grammar lambda_expr: "lambda" [`parameter_list`] ":" `expression` - lambda_expr_nocond: "lambda" [`parameter_list`] ":" `expression_nocond` Lambda expressions (sometimes called lambda forms) are used to create anonymous functions. The expression ``lambda parameters: expression`` yields a function diff --git a/Doc/whatsnew/3.9.rst b/Doc/whatsnew/3.9.rst index 4cb4940..d5eacca 100644 --- a/Doc/whatsnew/3.9.rst +++ b/Doc/whatsnew/3.9.rst @@ -267,6 +267,10 @@ Other Language Changes :func:`~operator.countOf` of the :mod:`operator` module. (Contributed by Serhiy Storchaka in :issue:`40824`.) +* Unparenthesized lambda expressions can no longer be the expression part in an + ``if`` clause in comprehensions and generator expressions. See :issue:`41848` + and :issue:`43755` for details. + New Modules =========== diff --git a/Misc/NEWS.d/next/Documentation/2021-04-06-14-55-45.bpo-43755.1m0fGq.rst b/Misc/NEWS.d/next/Documentation/2021-04-06-14-55-45.bpo-43755.1m0fGq.rst new file mode 100644 index 0000000..53cba0b --- /dev/null +++ b/Misc/NEWS.d/next/Documentation/2021-04-06-14-55-45.bpo-43755.1m0fGq.rst @@ -0,0 +1,3 @@ +Update documentation to reflect that unparenthesized lambda expressions can +no longer be the expression part in an ``if`` clause in comprehensions and +generator expressions since Python 3.9. |