MNT: do not use 'is not' on literal
py38 raises a SyntaxWarning on this
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@ -186,7 +186,7 @@ class HistogramLUTItem(GraphicsWidget):
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"""Return a lookup table from the color gradient defined by this
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HistogramLUTItem.
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"""
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if self.levelMode is not 'mono':
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if self.levelMode != 'mono':
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return None
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if n is None:
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if img.dtype == np.uint8:
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