Update CHANGELOG plus minor edits. Closes wireservice#499.

lcorbasson · Feb 18, 2016 · 400daa2 · 400daa2
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diff --git a/CHANGELOG.rst b/CHANGELOG.rst
@@ -1,6 +1,7 @@
 1.2.3
 -----
 
+* :class:`.MappedSequence` now throws explicit error on __setitem__. (#499)
 * Added a ``require_match`` argument to :meth:`.Table.join`. (#480)
 * Cookbook: Rename columns in a table. (#469)
 * :meth:`.Table.normalize` implemented. (#487)

diff --git a/agate/mapped_sequence.py b/agate/mapped_sequence.py
@@ -73,9 +73,8 @@ def __setitem__(self, key, value):
         """
         Set values by index, which we want to fail loudly.
         """
-        raise TypeError("Rows are read only and do not support item \
-assignment. Rather that overwrite your existing data, you could create a \
-new column based on its contents. Learn how here: \
+        raise TypeError("Agate data structures are read-only by design. \
+Consider creating a new column based on this structure's contents. Learn how here: \
 http://agate.readthedocs.org/en/latest/tutorial.html#computing-new-columns")
 
     def __iter__(self):