前言
不同的代码往往需要特定的运行环境。比如说有些代码需要在python3.6的环境下运行，有些代码需要在python2.7的环境下运行。这时就可以通过创建虚拟环境来营造代码运行适合的环境，而不会影响到自己本来的生产环境，所以就记录以下conda安装虚拟环境的命令，方便查阅。
conda的安装就不在这里详述，自行安装。
conda安装虚拟环境
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| conda create -n your_env_name python=version（2.7、3.6等)
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例如：
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| conda create -n py3.7.3 python=3.7.3
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会出现以下结果：
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| Collecting package metadata (current_repodata.json): done
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: done
environment location: /root/anaconda3/envs/py3.7.3
added / updated specs:
- python=3.7.3
The following packages will be downloaded:
package | build
---------------------------|-----------------
_libgcc_mutex-0.1 | main 3 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
ca-certificates-2020.6.24 | 0 125 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
certifi-2020.6.20 | py37_0 156 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
libedit-3.1.20191231 | h7b6447c_0 167 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
libffi-3.2.1 | hd88cf55_4 40 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
libgcc-ng-9.1.0 | hdf63c60_0 5.1 MB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
libstdcxx-ng-9.1.0 | hdf63c60_0 3.1 MB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
ncurses-6.2 | he6710b0_1 817 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
openssl-1.1.1g | h7b6447c_0 2.5 MB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
pip-20.1.1 | py37_1 1.7 MB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
python-3.7.3 | h0371630_0 32.1 MB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
readline-7.0 | h7b6447c_5 324 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
setuptools-47.3.1 | py37_0 514 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
sqlite-3.32.3 | h62c20be_0 1.1 MB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
tk-8.6.10 | hbc83047_0 3.0 MB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
wheel-0.34.2 | py37_0 51 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
xz-5.2.5 | h7b6447c_0 341 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
zlib-1.2.11 | h7b6447c_3 103 KB https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
------------------------------------------------------------
Total: 51.2 MB
The following NEW packages will be INSTALLED:
_libgcc_mutex anaconda/pkgs/main/linux-64::_libgcc_mutex-0.1-main
ca-certificates anaconda/pkgs/main/linux-64::ca-certificates-2020.6.24-0
certifi anaconda/pkgs/main/linux-64::certifi-2020.6.20-py37_0
libedit anaconda/pkgs/main/linux-64::libedit-3.1.20191231-h7b6447c_0
libffi anaconda/pkgs/main/linux-64::libffi-3.2.1-hd88cf55_4
libgcc-ng anaconda/pkgs/main/linux-64::libgcc-ng-9.1.0-hdf63c60_0
libstdcxx-ng anaconda/pkgs/main/linux-64::libstdcxx-ng-9.1.0-hdf63c60_0
ncurses anaconda/pkgs/main/linux-64::ncurses-6.2-he6710b0_1
openssl anaconda/pkgs/main/linux-64::openssl-1.1.1g-h7b6447c_0
pip anaconda/pkgs/main/linux-64::pip-20.1.1-py37_1
python anaconda/pkgs/main/linux-64::python-3.7.3-h0371630_0
readline anaconda/pkgs/main/linux-64::readline-7.0-h7b6447c_5
setuptools anaconda/pkgs/main/linux-64::setuptools-47.3.1-py37_0
sqlite anaconda/pkgs/main/linux-64::sqlite-3.32.3-h62c20be_0
tk anaconda/pkgs/main/linux-64::tk-8.6.10-hbc83047_0
wheel anaconda/pkgs/main/linux-64::wheel-0.34.2-py37_0
xz anaconda/pkgs/main/linux-64::xz-5.2.5-h7b6447c_0
zlib anaconda/pkgs/main/linux-64::zlib-1.2.11-h7b6447c_3
Proceed ([y]/n)? y
Downloading and Extracting Packages
libedit-3.1.20191231 | 167 KB |
xz-5.2.5 | 341 KB |
wheel-0.34.2 | 51 KB |
pip-20.1.1 | 1.7 MB |
openssl-1.1.1g | 2.5 MB |
python-3.7.3 | 32.1 MB |
libstdcxx-ng-9.1.0 | 3.1 MB |
ca-certificates-2020 | 125 KB |
libffi-3.2.1 | 40 KB |
ncurses-6.2 | 817 KB |
certifi-2020.6.20 | 156 KB |
libgcc-ng-9.1.0 | 5.1 MB |
_libgcc_mutex-0.1 | 3 KB |
zlib-1.2.11 | 103 KB |
tk-8.6.10 | 3.0 MB |
setuptools-47.3.1 | 514 KB |
readline-7.0 | 324 KB |
sqlite-3.32.3 | 1.1 MB |
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
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激活虚拟环境
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| conda activate my_env_name
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激活之后，命令行的最前面就会出现虚拟环境的名字如下：
退出虚拟环境
查看Conda环境下所有的虚拟环境
删除Conda虚拟环境
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| conda remove -n my_env_name --all
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my_env_name对应的就是要删除的虚拟环境名称