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    <p>Ordinarily I wouldn't recommend changing the source of a tool, but it's hacky to fix this outside and easy inside. So here's what I'd do if you needed this to work Right Now(tm), and sometimes you do..</p> <p>In the file <code>matplotlib/axes.py</code>, change the declaration of the pie function to</p> <pre><code>def pie(self, x, explode=None, labels=None, colors=None, autopct=None, pctdistance=0.6, shadow=False, labeldistance=1.1, start_angle=None): </code></pre> <p>i.e. simply add <code>start_angle=None</code> to the end of the arguments.</p> <p>Then add the five lines bracketed by "# addition".</p> <pre><code> for frac, label, expl in cbook.safezip(x,labels, explode): x, y = center theta2 = theta1 + frac thetam = 2*math.pi*0.5*(theta1+theta2) # addition begins here if start_angle is not None and i == 0: dtheta = (thetam - start_angle)/(2*math.pi) theta1 -= dtheta theta2 -= dtheta thetam = start_angle # addition ends here x += expl*math.cos(thetam) y += expl*math.sin(thetam) </code></pre> <p>Then if start_angle is None, nothing happens, but if start_angle has a value, then that's the location that the first slice (in this case the 20%) is centred on. For example,</p> <pre><code>patches, texts, autotexts = ax.pie(fracs, labels=labels, explode = explode, autopct='%1.1f%%', shadow =True, start_angle=0.75*pi) </code></pre> <p>produces</p> <p><img src="https://i.stack.imgur.com/YMU1I.png" alt="enter image description here"></p> <p>Note that in general you should avoid doing this, patching the source I mean, but there are times in the past when I've been on deadline and simply wanted something Now(tm), so there you go..</p>
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    1. POPlotting a pie-chart in matplotlib at a specific angle with the fracs on the wedges
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