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About pip downloading different versions of packages for update
Article directory
First update the current pip, because the next update needs to use the pip package
python -m pip install --upgrade pip
1. Uninstall first and then update
pip uninstall package
pip install pachage==版本号
pip upgrade package directly
pip install --upgrade 要升级的包名
2. Direct installation
Directly install the corresponding version of the package, the system will uninstall the old version first, and then install the new version
It is very convenient to cover directly!
pip install pachage==版本号
pip install -i https://pypi.tuna.tsinghua.edu.cn/simple packagename==版本号
例如：pip install -i https://pypi.tuna.tsinghua.edu.cn/simple tensorflow==1.5.0
3. Conda creates a new environment
Because of the virtual environment provided by conda, each environment is isolated, and the isolation is very good, so there is no impact.
For the version of a large package, just create a new env directly
conda create -n envname python=3.4
conda list
activate envname
source activate envname#linux用这个
source deactivate envname
deactivate envname#linux use this to delete the environment
source deactivate envname
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Note: Packages in different environments do not affect each other, neither pytorch nor cuda.
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