<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On 3 June 2017 at 21:55, MRAB <span dir="ltr"><<a href="mailto:python@mrabarnett.plus.com" target="_blank">python@mrabarnett.plus.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail-HOEnZb"><div class="gmail-h5"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">[...]<br></blockquote></div></div>
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Interestingly, '_' doesn't have that property, although Python does allow identifiers to start with it.</blockquote><div><br></div><div>Yes, it is special cased:<br><br>    if (!_PyUnicode_IsXidStart(first) && first != 0x5F /* LOW LINE */)<br>        return 0;<br><br>--<br></div><div>Ivan<br><br> <br></div></div></div></div>