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Created on 2017-04-09 23:26 by anthonypjshaw, last changed 2022-04-11 14:58 by admin. This issue is now closed.
| Pull Requests | |||
|---|---|---|---|
| URL | Status | Linked | Edit |
| PR 1069 | closed | anthonypjshaw, 2017-04-10 00:11 | |
| Messages (2) | |||
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| msg291398 - (view) | Author: anthony shaw (anthonypjshaw) *  |
Date: 2017-04-09 23:26 | |
This is related to issue26188, Using await in a simple statement (outside of an async def method) raises SyntaxError with the unhelpful message "invalid syntax". It seems obvious once you've read PEP492 in detail, but I think that as more and more developers use async/await this will stump lots of people. I've been trying to pick apart where this constraint is raised to see whether I can help with a PR, I've been through Grammar, Parser and then the AST and Compiler. Looking at https://github.com/python/cpython/blob/master/Python/compile.c#L4307-L4319 I can see there are helpful error messages, but during the tokenizer phase it checks that the syntax cannot be used unless you're within an async def method https://github.com/python/cpython/blob/6f0eb93183519024cb360162bdd81b9faec97ba6/Parser/tokenizer.c#L1574-L1583 I can't reproduce this in a REPL for 3.7.0a0, it never gets any further than the grammar or tokenizer phase. |
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| msg291399 - (view) | Author: anthony shaw (anthonypjshaw) * |
Date: 2017-04-10 00:02 | |
yey! I figured it out!! |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:45 | admin | set | github: 74215 |
| 2017-04-10 01:04:13 | anthonypjshaw | set | status: open -> closed stage: resolved |
| 2017-04-10 00:11:32 | anthonypjshaw | set | pull_requests: + pull_request1215 |
| 2017-04-10 00:02:45 | anthonypjshaw | set | messages: + msg291399 |
| 2017-04-09 23:26:16 | anthonypjshaw | create | |