drop python 2.7 from serialize.py (#812)

* drop python 2.7 from serialize.py * update changelog
alteryx · Nov 14, 2019 · 606c0c0 · 606c0c0
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diff --git a/docs/source/changelog.rst b/docs/source/changelog.rst
@@ -6,6 +6,7 @@ Changelog
     * Enhancements
     * Fixes
     * Changes
+        * Remove python 2.7 support from serialize.py (:pr:`812`)
     * Documentation Changes
         * remove python 2.7 support and add 3.7 in install.rst (:pr:`805`)
         * Fix import error in docs (:pr:`803`)

diff --git a/featuretools/entityset/serialize.py b/featuretools/entityset/serialize.py
@@ -95,7 +95,6 @@ def write_entity_data(entity, path, format='csv', **kwargs):
         df = entity.df.copy()
         columns = df.select_dtypes('object').columns
         df[columns] = df[columns].astype('unicode')
-        df.columns = df.columns.astype('unicode')  # ensures string column names for python 2.7
         df.to_parquet(file, **kwargs)
     elif format == 'pickle':
         entity.df.to_pickle(file, **kwargs)