sympy-is.patch

   1 --- sympy-sympy-1.4/sympy/plotting/plot.py.orig 2019-09-13 11:48:00.776818488 -0600
   2 +++ sympy-sympy-1.4/sympy/plotting/plot.py      2019-09-13 11:49:54.122923162 -0600
   3 @@ -526,7 +526,7 @@ class LineOver1DRangeSeries(Line2DBaseSe
   4                  else:
   5                      list_segments.append([p, q])
   6
   7 -            if self.xscale is 'log':
   8 +            if self.xscale == 'log':
   9                  self.start=np.log10(self.start)
  10                  self.end=np.log10(self.end)
  11