diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index ff5aaf032f51..c2a4d2f42c81 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -3267,7 +3267,8 @@ def set_xlim(self, left=None, right=None, emit=True, auto=False,
reverse = left > right
left, right = self.xaxis.get_major_locator().nonsingular(left, right)
left, right = self.xaxis.limit_range_for_scale(left, right)
- left, right = sorted([left, right], reverse=reverse)
+ # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+ left, right = sorted([left, right], reverse=bool(reverse))
self.viewLim.intervalx = (left, right)
if auto is not None:
@@ -3649,7 +3650,8 @@ def set_ylim(self, bottom=None, top=None, emit=True, auto=False,
reverse = bottom > top
bottom, top = self.yaxis.get_major_locator().nonsingular(bottom, top)
bottom, top = self.yaxis.limit_range_for_scale(bottom, top)
- bottom, top = sorted([bottom, top], reverse=reverse)
+ # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+ bottom, top = sorted([bottom, top], reverse=bool(reverse))
self.viewLim.intervaly = (bottom, top)
if auto is not None:
diff --git a/lib/matplotlib/axis.py b/lib/matplotlib/axis.py
index a4cdffc55e14..e23b5748cf7c 100644
--- a/lib/matplotlib/axis.py
+++ b/lib/matplotlib/axis.py
@@ -2156,7 +2156,8 @@ def get_minpos(self):
def set_inverted(self, inverted):
# docstring inherited
a, b = self.get_view_interval()
- self.axes.set_xlim(sorted((a, b), reverse=inverted), auto=None)
+ # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+ self.axes.set_xlim(sorted((a, b), reverse=bool(inverted)), auto=None)
def set_default_intervals(self):
# docstring inherited
@@ -2463,7 +2464,8 @@ def get_minpos(self):
def set_inverted(self, inverted):
# docstring inherited
a, b = self.get_view_interval()
- self.axes.set_ylim(sorted((a, b), reverse=inverted), auto=None)
+ # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+ self.axes.set_ylim(sorted((a, b), reverse=bool(inverted)), auto=None)
def set_default_intervals(self):
# docstring inherited
diff --git a/lib/mpl_toolkits/mplot3d/axes3d.py b/lib/mpl_toolkits/mplot3d/axes3d.py
index 4202be9a1138..047234b365f5 100644
--- a/lib/mpl_toolkits/mplot3d/axes3d.py
+++ b/lib/mpl_toolkits/mplot3d/axes3d.py
@@ -626,7 +626,8 @@ def set_xlim3d(self, left=None, right=None, emit=True, auto=False,
reverse = left > right
left, right = self.xaxis.get_major_locator().nonsingular(left, right)
left, right = self.xaxis.limit_range_for_scale(left, right)
- left, right = sorted([left, right], reverse=reverse)
+ # cast to bool to avoid bad interaction between python 3.8 and np.bool_
+ left, right = sorted([left, right], reverse=bool(reverse))
self.xy_viewLim.intervalx = (left, right)
if auto is not None:
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