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doc/source/whatsnew/v0.21.0.txt

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@@ -305,6 +305,9 @@ Performance Improvements
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Bug Fixes
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~~~~~~~~~
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- Compatibility with PyPy increased by removing the assumption that sets are sorted in ``usecols``
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(of ints) and by checking for a list object before calling PyList_GET_SIZE, which in both
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cases may be considered bugs
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Conversion
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^^^^^^^^^^
@@ -329,6 +332,8 @@ Indexing
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- Fixes ``DataFrame.loc`` for setting with alignment and tz-aware ``DatetimeIndex`` (:issue:`16889`)
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- Avoids ``IndexError`` when passing an Index or Series to ``.iloc`` with older numpy (:issue:`17193`)
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- Allow unicode empty strings as placeholders in multilevel columns in Python 2 (:issue:`17099`)
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- Tests split into cases for CPython and PyPy where needed, which highlights the fragility
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of index matching with ``float('nan')``, ``np.nan`` and ``NAT``.
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I/O
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^^^

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