fix non-int indexing of time-lapse data (#1945)

quiltdata · Jan 15, 2021 · e899aa9 · e899aa9
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diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
@@ -15,6 +15,7 @@
 ## Catalog, Lambdas
 * [Added] Generate and resolve Quilt package URIs ([#1935](https://github.com/quiltdata/quilt/pull/1935))
 * [Changed] Tree view for files in package update dialog ([#1989](https://github.com/quiltdata/quilt/pull/1989))
+* [Fixed] lambda previews for time series `AICSImage` data (potential `IndexError` if odd number of time points) ([#1945](https://github.com/quiltdata/quilt/pull/1945))
 
 # 3.3.0 - 2020-12-08
 ## Python API

diff --git a/lambdas/thumbnail/index.py b/lambdas/thumbnail/index.py
@@ -163,7 +163,7 @@ def _format_n_dim_ndarray(img: AICSImage) -> np.ndarray:
         img = AICSImage(img.data[0, :, :, :, :, :])
     # Always choose middle time slice
     if "T" in img.reader.dims:
-        img = AICSImage(img.data[0, img.data.shape[1] / 2, :, :, :, :])
+        img = AICSImage(img.data[0, img.data.shape[1] // 2, :, :, :, :])
 
     # Keep Channel data, but max project when possible
     if "C" in img.reader.dims: