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librosa 0.7版本支持python2.7环境，后续的版本就要求python3的环境。
使用命令pip install librosa==0.7.0直接安装的话，会要求依赖包numba>=0.38.0
但是实际运行的话会安装numba 0.47，而numba 0.47会要求llvmlite版本是0.32,但是llvmlite 0.32是不支持python 2.7版本的。
Collecting numba>=0.38.0 (from librosa==0.7.0)
Downloading http://pypi.doubanio.com/packages/83/f2/938d6b0e6b0be158d7beb7cc6067243783d219e8e0a7474bbe69d0fb5472/numba-0.47.0-cp27-cp27mu-manylinux1_x86_64.whl (3.6MB)
|████████████████████████████████| 3.6MB 505kB/s
Requirement already satisfied: soundfile>=0.9.0 in /media/boystray/three/.conda/envs/tensotflow/lib/python2.7/site-packages (from librosa==0.7.0) (0.10.3.post1)
Requirement already satisfied: funcsigs; python_version < "3.3" in /media/boystray/three/.conda/envs/tensotflow/lib/python2.7/site-packages (from numba>=0.38.0->librosa==0.7.0) (1.0.2)
Requirement already satisfied: singledispatch; python_version < "3.4" in /media/boystray/three/.conda/envs/tensotflow/lib/python2.7/site-packages (from numba>=0.38.0->librosa==0.7.0) (3.4.0.3)
Requirement already satisfied: enum34; python_version < "3.4" in /media/boystray/three/.conda/envs/tensotflow/lib/python2.7/site-packages (from numba>=0.38.0->librosa==0.7.0) (1.1.6)
Requirement already satisfied: setuptools in /home/boystray/.local/lib/python2.7/site-packages (from numba>=0.38.0->librosa==0.7.0) (41.0.1)
Collecting llvmlite>=0.31.0dev0 (from numba>=0.38.0->librosa==0.7.0)
Downloading http://pypi.doubanio.com/packages/50/cc/04526507e80d546be5688ce0246e40277b61e7949c3347c6609b6a4154cf/llvmlite-0.32.1.tar.gz (104kB)
解决办法是手动安装numba 0.38.0版本
pip install numba==0.38.0 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
然后安装librosa 0.7.0版本
pip install librosa==0.7.0 -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
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