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在Mac上安装rpy2时出错

我试图在Mac OS High Sierra版本10.13.2上的python 2.7.14上安装rpy2，但是当我尝试编写命令时

pip install rpy2

我得到以下输出：

Collecting rpy2
  Using cached rpy2-2.9.2.tar.gz
    Complete output from command python setup.py egg_info:
    rpy2 is no longer supporting Python < 3. Consider using an older rpy2 release when using an older Python release.

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/11/xgl2d8l16wd8xv2_lmdtcmwc0000gn/T/pip-build-aJMHfU/rpy2/
You are using pip version 9.0.1, however version 9.0.3 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

Run Code Online (Sandbox Code Playgroud)

我已经尝试通过输入来升级pip包