为什么 python setup.py 给出“错误：选项 --install-dir 无法识别”错误？

Question

当我尝试将 python 项目安装到自定义本地 python 存储库中时，我使用以下命令：

python setup.py install --install-dir /home/peng/python-temp

其中 setup.py 是 python 项目 Keras 的简单 setuptools 脚本：

https://github.com/keras-team/keras/blob/master/setup.py

但此命令会触发以下错误：

usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
   or: setup.py --help [cmd1 cmd2 ...]
   or: setup.py --help-commands
   or: setup.py cmd --help

error: option --install-dir not recognized

为什么错误提示中的参数不存在？我应该用什么来有效地替代它？

更新1

参数--install-dir是由setup.py触发的以下错误信息提示的：

python setup.py install
running install

error: can't create or remove files in install directory
The following error occurred while trying to add or remove files in the
installation directory:

    [Errno 13] Permission denied: '/usr/local/lib/python3.6/dist-packages/test-easy-install-13269.write-test'

The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

    /usr/local/lib/python3.6/dist-packages/

UPDATE2我尝试了“--prefix”选项，这就是我得到的：

python setup.py install --prefix /home/peng/python-temp
running install
Checking .pth file support in /home/peng/python-temp/lib/python3.6/site-packages/
/opt/conda3/bin/python -E -c pass
TEST FAILED: /home/peng/python-temp/lib/python3.6/site-packages/ does NOT support .pth files
error: bad install directory or PYTHONPATH

You are attempting to install a package to a directory that is not
on PYTHONPATH and which Python does not read ".pth" files from.  The
installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

    /home/peng/python-temp/lib/python3.6/site-packages/

and your PYTHONPATH environment variable currently contains:

    ''

Here are some of your options for correcting the problem:

* You can choose a different installation directory, i.e., one that is
  on PYTHONPATH or supports .pth files

* You can add the installation directory to the PYTHONPATH environment
  variable.  (It must then also be on PYTHONPATH whenever you run
  Python and want to use the package(s) you are installing.)

* You can set up the installation directory to support ".pth" files by
  using one of the approaches described here:

  https://setuptools.readthedocs.io/en/latest/easy_install.html#custom-installation-locations


Please make the appropriate changes for your system and try again.

所以它们都不起作用。