-bash: pip: 未找到命令 python: can't open file 'pip': [Errno 2] No such file or directory ImportError: No module named psycopg2 EPEL源直接通过执行yum命令安装EPEL 阿里云源1、备份(如有配置其他epel源)2、下载新repo 到/etc/yum.repos.d/ 安装EPEL 163镜像源1：备份你的原镜像文件，以免出错后可以恢复。2：下载新的CentOS-Base.repo 到/etc/yum.repos.d/ pip install psycopg2-binary EPEL源
EPEL（Extra Packages for Enterprise Linux）是由 Fedora 社区打造，为 RHEL 及衍生发行版如 CentOS等提供高质量软件包的项目。装上了 EPEL，就像在 Fedora 上一样，可以通过 yum install 软件包名，即可安装很多以前需要编译安装的软件、常用的软件或一些比较流行的软件，比如现在流行的nginx、htop、ncdu、vnstat等等，都可以使用EPEL很方便的安装更新。
直接通过执行yum命令执行命令： yum install epel-release 直接进行安装，如果此命令无法安装可以尝试以下方法
安装EPEL 阿里云源 1、备份(如有配置其他epel源)mv /etc/yum.repos.d/epel.repo /etc/yum.repos.d/epel.repo.backup
mv /etc/yum.repos.d/epel-testing.repo /etc/yum.repos.d/epel-testing.repo.backup
2、下载新repo 到/etc/yum.repos.d/epel(RHEL 7)
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
安装EPEL 163镜像源 1：备份你的原镜像文件，以免出错后可以恢复。mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2：下载新的CentOS-Base.repo 到/etc/yum.repos.d/wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo
安装了epel源之后先清空历史缓存再构建新的缓存
yum clean all yum makecache使用 yum install python-pip 进行安装pip
pip Usage: pip <command> [options] Commands: install Install packages. download Download packages. uninstall Uninstall packages. freeze Output installed packages in requirements format. list List installed packages. show Show information about installed packages. search Search PyPI for packages. wheel Build wheels from your requirements. hash Compute hashes of package archives. completion A helper command used for command completion help Show help for commands. General Options: -h, --help Show help. --isolated Run pip in an isolated mode, ignoring environment variables and user configuration. -v, --verbose Give more output. Option is additive, and can be used up to 3 times. -V, --version Show version and exit. -q, --quiet Give less output. --log <path> Path to a verbose appending log. --proxy <proxy> Specify a proxy in the form [user:passwd@]proxy.server:port. --retries <retries> Maximum number of retries each connection should attempt (default 5 times). --timeout <sec> Set the socket timeout (default 15 seconds). --exists-action <action> Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup. --trusted-host <hostname> Mark this host as trusted, even though it does not have valid or any HTTPS. --cert <path> Path to alternate CA bundle. --client-cert <path> Path to SSL client certificate, a single file containing the private key and the certificate in PEM format. --cache-dir <dir> Store the cache data in <dir>. --no-cache-dir Disable the cache. --disable-pip-version-check Don't periodically check PyPI to determine whether a new version of pip is available for download. Implied with --no-index. pip install psycopg2-binary
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