testing.py 文件源码

def skip_if_no_ne(engine='numexpr'):
    import nose
    _USE_NUMEXPR = pd.computation.expressions._USE_NUMEXPR

    if engine == 'numexpr':
        try:
            import numexpr as ne
        except ImportError:
            raise nose.SkipTest("numexpr not installed")

        if not _USE_NUMEXPR:
            raise nose.SkipTest("numexpr disabled")

        if ne.__version__ < LooseVersion('2.0'):
            raise nose.SkipTest("numexpr version too low: "
                                "%s" % ne.__version__)