Author steven.daprano
Recipients ezio.melotti, steven.daprano, vstinner
Date 2018-05-31.04:53:08
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Message-id <1527742389.0.0.682650639539.issue33705@psf.upfronthosting.co.za>
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There is a loophole in the Unicode normalisation which allows the creation of names matching keywords.

class Spam:
    locals()['if'] = 1

Spam.𝐢𝐟    # U+1D422 U+1D41F
# returns 1

Those two characters are 'MATHEMATICAL BOLD SMALL I' and 'MATHEMATICAL BOLD SMALL F'. They ought to be normalised to "if", which is a keyword.

Of course Spam.if is a syntax error, and I believe Spam.𝐢𝐟 ought to be as well.

Another example:

py> globals()['for'] = 2
py> 𝐟or
2



I also asked about this here:

https://mail.python.org/pipermail/python-dev/2018-May/153619.html
History
Date User Action Args
2018-05-31 04:53:09steven.dapranosetrecipients: + steven.daprano, vstinner, ezio.melotti
2018-05-31 04:53:09steven.dapranosetmessageid: <1527742389.0.0.682650639539.issue33705@psf.upfronthosting.co.za>
2018-05-31 04:53:08steven.dapranolinkissue33705 messages
2018-05-31 04:53:08steven.dapranocreate