Yes。
不得不佩服这帮开发conda的程序员，使用Conda可以回滚（rollback）到上一次的安装状态，而且还非常简单。
我在某个环境安装某个软件后，我以为没有依赖这个环境的软件，所以一路yes，结果python从2.7上升到了3.6，还有其他几个包被增加和更新。结果我有些软件用不了了！还好一查，Conda提供了回滚的功能特性。
查看conda更新历史
使用conda list --revision
$ conda list --revision
2018-11-19 19:22:48 (rev 0)
+ca-certificates-2018.03.07 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+certifi-2018.10.15 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+libedit-3.1.20170329 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+libffi-3.2.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+libgcc-ng-8.2.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+libstdcxx-ng-8.2.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+ncurses-6.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+openssl-1.1.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+pip-18.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+python-2.7.15 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+readline-7.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+setuptools-40.5.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+sqlite-3.25.2 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+tk-8.6.8 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+wheel-0.32.2 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+zlib-1.2.11 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
2018-11-20 14:51:23 (rev 1)
+libfuse-3.2.5 (jessetg/label/sbu-hpc)
2018-11-20 14:54:48 (rev 2)
+java-jdk-8.0.112 (bioconda)
+openjdk-8.0.112 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge)
2018-11-20 15:14:39 (rev 3)
openjdk {8.0.112 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/conda-forge) -> 8.0.152 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)}
-java-jdk-8.0.112 (bioconda)
2019-02-25 10:19:10 (rev 4)
ca-certificates {2018.03.07 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main) -> 2019.1.23 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)}
certifi {2018.10.15 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main) -> 2018.11.29 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)}
pip {18.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main) -> 19.0.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)}
python {2.7.15 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main) -> 3.6.7 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)}
setuptools {40.5.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main) -> 40.8.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)}
wheel {0.32.2 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main) -> 0.32.3 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)}
+asn1crypto-0.24.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+cffi-1.11.5 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+chardet-3.0.4 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+cryptography-2.5 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+idna-2.8 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+pycparser-2.19 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+pyega3-3.0.21 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/bioconda)
+pyopenssl-19.0.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+pysocks-1.6.8 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+requests-2.21.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+six-1.12.0 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+tqdm-4.31.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+urllib3-1.24.1 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
+xz-5.2.4 (https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main)
可以看到rev 4就是我今天做的更改。要改回rev 3也很简单。
回滚
使用conda install --revision N，N这里是指更改历史的序号。
$ conda install --revision 3
## Package Plan ##
environment location: /public/home/liuxs/anaconda3/envs/icgc
added / updated specs:
- libfuse
- pyega3
The following packages will be REMOVED:
asn1crypto: 0.24.0-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
cffi: 1.11.5-py36he75722e_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
chardet: 3.0.4-py36_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
cryptography: 2.5-py36h1ba5d50_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
idna: 2.8-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
pycparser: 2.19-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
pyega3: 3.0.21-py36_1 https://mirrors.tuna.tsinghua.edu.cn/anaconda/cloud/bioconda
pyopenssl: 19.0.0-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
pysocks: 1.6.8-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
requests: 2.21.0-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
six: 1.12.0-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
tqdm: 4.31.1-py_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
urllib3: 1.24.1-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
xz: 5.2.4-h14c3975_4 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
The following packages will be DOWNGRADED:
ca-certificates: 2019.1.23-0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main --> 2018.03.07-0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
certifi: 2018.11.29-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main --> 2018.10.15-py27_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
pip: 19.0.1-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main --> 18.1-py27_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
python: 3.6.7-h0371630_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main --> 2.7.15-h9bab390_2 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
setuptools: 40.8.0-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main --> 40.5.0-py27_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
wheel: 0.32.3-py36_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main --> 0.32.2-py27_0 https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/main
Proceed ([y]/n)? y
Preparing transaction: done
Verifying transaction: done
Executing transaction: done
Conda大法好。
参考：
