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gh-157244: Fix potential division by zero in turtle.py #157245

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gh-157244: Fix potential division by zero in turtle.py #157245

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4 changes: 4 additions & 0 deletions Lib/turtle.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1095,6 +1095,8 @@ def setworldcoordinates(self, llx, lly, urx, ury):
self.mode("world")
xspan = float(urx - llx)
yspan = float(ury - lly)
if xspan == 0 or yspan == 0:
raise ValueError("Width and height must be greater than zero")
wx, wy = self._window_size()
self.screensize(wx-20, wy-20)
oldxscale, oldyscale = self.xscale, self.yscale
Expand Down Expand Up @@ -2055,6 +2057,8 @@ def circle(self, radius, extent = None, steps = None):
if steps is None:
frac = abs(extent)/self._fullcircle
steps = 1+int(min(11+abs(radius)/6.0, 59.0)*frac)
if steps == 0:
raise ValueError("steps must not be zero")
w = 1.0 * extent / steps
w2 = 0.5 * w
l = 2.0 * radius * math.sin(math.radians(w2)*self._degreesPerAU)
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