matplotlib
diff --git a/‎lib/matplotlib/backends/qt_compat.py
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diff --git a/‎lib/matplotlib/figure.py
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diff --git a/‎lib/matplotlib/stackplot.py
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@@ -190,7 +190,6 @@ def _getSaveFileName(*args, **kwargs):
         _getSaveFileName = QtWidgets.QFileDialog.getSaveFileName
     except ImportError:
         # tried PySide2, failed, fall back to PySide
-        QT_API = rcParams['backend.qt4']
         QT_RC_MAJOR_VERSION = 4
         QT_API = QT_API_PYSIDE
 
 
@@ -717,7 +717,6 @@ def set_size_inches(self, w, h=None, forward=True):
         if not all(np.isfinite(_) for _ in (w, h)):
             raise ValueError('figure size must be finite not '
                              '({}, {})'.format(w, h))
-        dpival = self.dpi
         self.bbox_inches.p1 = w, h
 
         if forward:
 
@@ -86,7 +86,6 @@ def stackplot(axes, x, *args, **kwargs):
 
     elif baseline == 'weighted_wiggle':
         m, n = y.shape
-        center = np.zeros(n)
         total = np.sum(y, 0)
         # multiply by 1/total (or zero) to avoid infinities in the division:
         inv_total = np.zeros_like(total)