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— Abstract Syntax Trees...target, value) A named expression. This AST node is produced by the assignment expressions operator (also known as the walrus operator). As opposed to the Assign node in which the first argument can be multiple nodes, in this case both tar...- 5. Data Structures...>> non_null 'Trondheim' Note that in Python, unlike C, assignment inside expressions must be done explicitly with the walrus operator :=. This avoids a common class of problems encountered in C programs: typing = in an expression when ==...
- 6. Expressions..._expression ::= [identifier ":="] expression An assignment expression (sometimes also called a “named expression” or “walrus”) assigns an expression to an identifier, while also returning the value of the expression. One common use case i...
- Changelog...gs. Patch provided by Yurii Karabas. bpo-42374: Fix a regression introduced by the new parser, where an unparenthesized walrus operator was not allowed within generator expressions. bpo-42316: Allow an unparenthesized walrus in subscript in...
- Design and History FAQ...se. Why can’t I use an assignment in an expression? Starting in Python 3.8, you can! Assignment expressions using the walrus operator := assign a variable in an expression: while chunk := fp.read(200): print(chunk) See PEP 572 for mo...
- What’s New In Python 3.8...re is new syntax := that assigns values to variables as part of a larger expression. It is affectionately known as “the walrus operator” due to its resemblance to the eyes and tusks of a walrus. In this example, the assignment expression he...