我想安装以下库：
- python-sip
- pyton-psutil
但是，我收到以下错误：
nakrule@mordor ~ % pacman -S python-psutil
[sudo] password for nakrule:
Sorry, try again.
[sudo] password for nakrule:
resolving dependencies...
looking for conflicting packages...
Packages (1) python-psutil-5.4.7-1
Total Installed Size: 1.95 MiB
:: Proceed with installation? [Y/n] y
(1/1) checking keys in keyring [----------------------------------] 100%
(1/1) checking package integrity [----------------------------------] 100%
(1/1) loading package files [----------------------------------] 100%
(1/1) checking for file conflicts [----------------------------------] 100%
error: failed to commit transaction (conflicting files)
python-psutil: /usr/lib/python3.7/site-packages/psutil-5.4.7-py3.7.egg-info/PKG-INFO exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil-5.4.7-py3.7.egg-info/SOURCES.txt exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil-5.4.7-py3.7.egg-info/dependency_links.txt exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil-5.4.7-py3.7.egg-info/not-zip-safe exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil-5.4.7-py3.7.egg-info/top_level.txt exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__init__.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/__init__.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_common.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_compat.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_exceptions.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_psaix.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_psbsd.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_pslinux.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_psosx.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_psposix.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_pssunos.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/__pycache__/_pswindows.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_common.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_compat.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_exceptions.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_psaix.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_psbsd.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_pslinux.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_psosx.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_psposix.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_pssunos.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_psutil_linux.cpython-37m-x86_64-linux-gnu.so exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_psutil_posix.cpython-37m-x86_64-linux-gnu.so exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/_pswindows.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__init__.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__main__.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/__init__.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/__main__.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_aix.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_bsd.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_connections.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_contracts.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_linux.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_memory_leaks.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_misc.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_osx.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_posix.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_process.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_sunos.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_system.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_unicode.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/__pycache__/test_windows.cpython-37.pyc exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_aix.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_bsd.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_connections.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_contracts.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_linux.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_memory_leaks.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_misc.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_osx.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_posix.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_process.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_sunos.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_system.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_unicode.py exists in filesystem
python-psutil: /usr/lib/python3.7/site-packages/psutil/tests/test_windows.py exists in filesystem
Errors occurred, no packages were upgraded.
1 nakrule@mordor ~ % pacman -S python-sip :(
resolving dependencies...
looking for conflicting packages...
Packages (1) python-sip-4.19.13-1
Total Installed Size: 0.24 MiB
:: Proceed with installation? [Y/n] y
(1/1) checking keys in keyring [----------------------------------] 100%
(1/1) checking package integrity [----------------------------------] 100%
(1/1) loading package files [----------------------------------] 100%
(1/1) checking for file conflicts [----------------------------------] 100%
error: failed to commit transaction (conflicting files)
python-sip: /usr/lib/python3.7/site-packages/sip.so exists in filesystem
Errors occurred, no packages were upgraded.
这些文件怎么可能已经存在，我该怎么做才能解决这个问题？
先感谢您。
答案1
pacman将拒绝覆盖它未跟踪的文件，即未在其本地数据库中列出的文件。
此类文件可能是在不使用 的情况下安装的pacman，无论是由您手动安装还是由某个程序代表您安装。
简而言之，如果这些文件不属于任何软件包 - 并且您知道您没有破坏任何内容 - 您可以使用该--overwrite选项安装新软件包，该选项可以pacman绕过文件冲突检查并覆盖冲突文件（请参阅man pacman扩展解释）：
# pacman -S --overwrite <glob> package_name
但请注意，ArchWiki警告不要使用 --overwrite（因为它需要一个包含 glob 的参数）。请参阅故障排除相关页面的部分，当前涵盖您的案例。
pacman您可以通过查询的数据库来知道哪个包确实拥有文件（如果有） ：
$ pacman -Qo /path/to/file
一种识别方法全部不属于任何包的文件如图所示这一页ArchWiki 的。