[issue46820] SyntaxError on `1not in...`

[Patrick Reader]

New submission from Patrick Reader <pxeger at protonmail.com>:

The following code gives a SyntaxError in 3.10, but used to work fine before (I have tested it in 2.7, 3.8, 3.9):

    1not in [2, 3]

It seems to be only the `not in` syntax which is affected; all other keywords still work correctly:

    1in [2, 3]
    1or 2
    1and 2
    1if 1else 1
    1is 1

I know this syntax is deprecated in 3.10 (bpo43833), but it still needs to work for now, so that old code written like this can keep working.

----------
components: Parser
messages: 413664
nosy: lys.nikolaou, pablogsal, pxeger
priority: normal
severity: normal
status: open
title: SyntaxError on `1not in...`
type: behavior
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46820>
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