-bash: pip: 未找到命令 python: can‘t open file ‘pip‘: [Errno 2] No such file or directory

-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  [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 to a verbose appending log.
  --proxy              Specify a proxy in the form [user:passwd@]proxy.server:port.
  --retries          Maximum number of retries each connection should attempt (default 5 times).
  --timeout              Set the socket timeout (default 15 seconds).
  --exists-action     Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup.
  --trusted-host    Mark this host as trusted, even though it does not have valid or any HTTPS.
  --cert                Path to alternate CA bundle.
  --client-cert         Path to SSL client certificate, a single file containing the private key and the
                              certificate in PEM format.
  --cache-dir            Store the cache data in .
  --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