<div dir="ltr"><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:#000000"><span class="gmail-im" style="color:rgb(80,0,80);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">for v in iter(get_something, INCOVENIENT_SENTINEL):<br> do_something(v)<br></blockquote><br></span><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">> There are many ways round my use case, all of them inelegant. That has to</span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:#000000"><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">> be one of the less comprehensible alternatives.</span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:#000000"><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:#000000"><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">In for-loops (because they include an assignment already) we can improve</span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:#000000"><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:12.8px;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">this with more indicatively named functions in practice.</span></div><div class="gmail_default" style="font-family:verdana,sans-serif;font-size:small;color:#000000"><br></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><span style="color:rgb(115,115,115);font-style:italic;line-height:18px"><font size="1" face="monospace, monospace">-- Carl Smith</font></span><br></div></div><div><span style="color:rgb(115,115,115);font-style:italic;line-height:18px"><font size="1" face="monospace, monospace"><a href="mailto:carl.input@gmail.com" target="_blank">carl.input@gmail.com</a></font></span></div></div></div></div></div></div>
<br><div class="gmail_quote">On 21 May 2018 at 14:14, Rhodri James <span dir="ltr"><<a href="mailto:rhodri@kynesim.co.uk" target="_blank">rhodri@kynesim.co.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">On 21/05/18 12:29, Daniel Moisset wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 21 May 2018 at 12:05, Rhodri James <<a href="mailto:rhodri@kynesim.co.uk" target="_blank">rhodri@kynesim.co.uk</a>> wrote:<br>
<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<br>
Thanks for the analysis, but I'm afraid I must disagree with your<br>
recommendation. It was the thought I first had when Chris came out with<br>
his first draft of the PEP several months ago, but it's not enough to cope<br>
with my usual use cases. What I normally want is the Python equivalent of:<br>
<br>
while ((v = get_something()) != INCONVENIENT_SENTINEL)<br>
do_something(v);<br>
<br>
The condition expression itself is not what I want to capture; I need a<br>
subexpression, which the "as" syntax won't give me.<br>
<br>
<br>
</blockquote>
That use case should be covered by<br>
<br>
for v in iter(get_something, INCOVENIENT_SENTINEL):<br>
do_something(v)<br>
</blockquote>
<br></span>
There are many ways round my use case, all of them inelegant. That has to be one of the less comprehensible alternatives.<div class="HOEnZb"><div class="h5"><br>
<br>
-- <br>
Rhodri James *-* Kynesim Ltd<br>
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