step1.选择python版本创建小环境
export PATH=/home/appl/anaconda3/bin:$PATH
conda create -n python2.7 python=2.7
source activate python2.7
step2.在anaconda网站(https://anaconda.org/)上找所需包的安装命令
conda install -c conda-forge numpy
step3.调用
export PATH=/home/appl/anaconda3/envs/python2.7/bin/:$PATH
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