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Require numexpr 2.6.2 #15382

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6 changes: 5 additions & 1 deletion doc/source/whatsnew/v0.20.0.txt
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@@ -1,12 +1,16 @@
.. _whatsnew_0200:

v0.20.0 (????, 2016)
v0.20.0 (????, 2017)
--------------------

This is a major release from 0.19 and includes a small number of API changes, several new features,
enhancements, and performance improvements along with a large number of bug fixes. We recommend that all
users upgrade to this version.

.. warning::

Due to important fixes and performance improvements, ``numexpr`` version is now required to be >= 2.6.2 and it will not be used at all if this requisite is not fullfilled (:issue:`15213`).

Highlights include:

- Building pandas for development now requires ``cython >= 0.23`` (:issue:`14831`)
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15 changes: 3 additions & 12 deletions pandas/computation/__init__.py
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Expand Up @@ -7,22 +7,13 @@
try:
import numexpr as ne
ver = ne.__version__
_NUMEXPR_INSTALLED = ver >= LooseVersion('2.1')
_NUMEXPR_INSTALLED = ver >= LooseVersion('2.6.2')

# we specifically disallow 2.4.4 as
# has some hard-to-diagnose bugs
if ver == LooseVersion('2.4.4'):
_NUMEXPR_INSTALLED = False
warnings.warn(
"The installed version of numexpr {ver} is not supported "
"in pandas and will be not be used\n".format(ver=ver),
UserWarning)

elif not _NUMEXPR_INSTALLED:
if not _NUMEXPR_INSTALLED:
warnings.warn(
"The installed version of numexpr {ver} is not supported "
"in pandas and will be not be used\nThe minimum supported "
"version is 2.1\n".format(ver=ver), UserWarning)
"version is 2.6.2\n".format(ver=ver), UserWarning)

except ImportError: # pragma: no cover
pass
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