Fix SyntaxWarning (#1874)

``` SyntaxWarning: "is" with a literal. Did you mean "=="? ```
rasterio · Feb 25, 2020 · e855631 · e855631
1 parent 78e05b0
commit e855631
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/rasterio/plot.py b/rasterio/plot.py
@@ -257,7 +257,7 @@ def show_hist(source, bins=10, masked=True, title='Histogram', ax=None, **kwargs
     # so we need the overall min/max to constrain the plot
     rng = np.nanmin(arr), np.nanmax(arr)
 
-    if len(arr.shape) is 2:
+    if len(arr.shape) == 2:
         arr = np.expand_dims(arr.flatten(), 0).T
         colors = ['gold']
     else: