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<p>Trying to find a smart way to install Python dependencies for the
users that will not potentially not work or even break stuff is a
very hard thing(tm). Check out these two QEPs for a lot of
discussion and possible approaches:<br>
<br>
<a class="moz-txt-link-freetext" href="https://github.com/qgis/QGIS-Enhancement-Proposals/issues/202">https://github.com/qgis/QGIS-Enhancement-Proposals/issues/202</a><br>
<a class="moz-txt-link-freetext" href="https://github.com/qgis/QGIS-Enhancement-Proposals/issues/179">https://github.com/qgis/QGIS-Enhancement-Proposals/issues/179</a></p>
<p>Cheers, Hannes<br>
</p>
<div class="moz-cite-prefix">Am 06.04.22 um 00:10 schrieb Pedro
Camargo via QGIS-Developer:<br>
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<blockquote type="cite"
cite="mid:17ffbc72799.86c43b9f23292.7962298494395626212@margo.co">
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<div>Hey Aron,<br>
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<div> I did explore that route, but I found
out that it would fail when the user did not have
administrator rights (or even if QGIS had not been ran as
administrator on Windows). Did you find it to be different?<br>
</div>
<div><br>
</div>
<div>Cheers,<br>
</div>
<div>Pedro<br>
</div>
<div><br>
</div>
<div><br>
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<div id="Zm-_Id_-Sgn1">---- On Wed, 06 Apr 2022 03:28:09 +1000
<b>Aron Gergely <a class="moz-txt-link-rfc2396E" href="mailto:aron.gergely@rasterra.nl"><aron.gergely@rasterra.nl></a></b> wrote
----<br>
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<blockquote style="border-left: 1px solid rgb(204, 204, 204);
padding-left: 6px; margin: 0px 0px 0px 5px;">
<div>
<p>Thank you, I checked out your plugin - yes that seems
also a good way.<br>
I already had the logic to detect, throw message, guide
to dialog, etc... implemented similar to yours.<br>
<br>
But I wanted to let pip manage the actual package, so I
went with the subprocess+pip route. Here is a minimum
working example:<br>
</p>
<pre style="background-color: rgb(43,43,43);color: rgb(169,183,198);font-family: "JetBrains Mono", monospace;font-size: 9.8pt;"><span class="colour" style="color:rgb(204, 120, 50)">import </span>subprocess
<span class="colour" style="color:rgb(204, 120, 50)">import </span>sys
<span class="colour" style="color:rgb(204, 120, 50)">try</span>:
subprocess.check_call((sys.executable<span class="colour" style="color:rgb(204, 120, 50)">, </span><span class="colour" style="color:rgb(106, 135, 89)">'-m'</span><span class="colour" style="color:rgb(204, 120, 50)">, </span><span class="colour" style="color:rgb(106, 135, 89)">'pip'</span><span class="colour" style="color:rgb(204, 120, 50)">, </span><span class="colour" style="color:rgb(106, 135, 89)">'install'</span><span class="colour" style="color:rgb(204, 120, 50)">, </span><span class="colour" style="color:rgb(106, 135, 89)">'h3<=3.99'</span>))
<span class="colour" style="color:rgb(204, 120, 50)">except </span>subprocess.CalledProcessError <span class="colour" style="color:rgb(204, 120, 50)">as </span>e:
<span class="colour" style="color:rgb(204, 120, 50)">raise </span>e <span class="colour" style="color:rgb(128, 128, 128)"># handle any errors here instead</span>
</pre>
<p>I connected it to a button in a dialog. And catch
stdout, stderr and the exit code of the subprocess so I
can show the user what is happening.<br>
<br>
Have not yet tried on other platforms than Linux. But
sys.executable is there to solve the ambiguity of python
executable path.<br>
<br>
<br>
Best regards,<br>
Aron<br>
<br>
<br>
</p>
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