conda 安装的包都在目录Anaconda/pkgs下。随着使用，conda 安装的包也越来越多；有时候会出现以下不好的情况：
- 有些包安装之后，从来没有使用过；
- 一些安装包的tar包也保留在了计算机中；
- 由于依赖或者环境等原因，某些包的不同版本重复安装。
上面的这些情况使得anaconda显得更加冗余，并且浪费储存；对于这些情况可以使用conda clean 净化Anaconda。
# 查看conda clean使用参数
$ conda clean -H
usage: conda clean [-h] [-a] [-i] [-l] [-p] [-t] [-f]
[-c TEMPFILES [TEMPFILES ...]] [-d] [--json] [-q] [-v] [-y]
Remove unused packages and caches.
Options:
optional arguments:
-h, --help Show this help message and exit.
Removal Targets:
-a, --all Remove index cache, lock files, unused cache packages,
and tarballs.
-i, --index-cache Remove index cache.
-l, --lock Remove all conda lock files.
-p, --packages Remove unused packages from writable package caches.
WARNING: This does not check for packages installed
using symlinks back to the package cache.
-t, --tarballs Remove cached package tarballs.
-f, --force-pkgs-dirs
Remove *all* writable package caches. This option is
not included with the --all flag. WARNING: This will
break environments with packages installed using
symlinks back to the package cache.
-c TEMPFILES [TEMPFILES ...], --tempfiles TEMPFILES [TEMPFILES ...]
Remove temporary files that could not be deleted
earlier due to being in-use. Argument is path(s) to
prefix(es) where files should be found and removed.
Output, Prompt, and Flow Control Options:
-d, --dry-run Only display what would have been done.
--json Report all output as json. Suitable for using conda
programmatically.
-q, --quiet Do not display progress bar.
-v, --verbose Can be used multiple times. Once for INFO, twice for
DEBUG, three times for TRACE.
-y, --yes Do not ask for confirmation.
Examples:
conda clean --tarballs
# conda clean使用
## 删除从不使用的包
$ conda clean --packages
## 删除tar包
$ conda clean --tarballs
## 删除索引缓存、锁定文件、未使用过的包和tar包。
$ conda clean -a
参考：
conda clean
