现在，在Python 2.7中安装NumPy + SciPy会失败，并显示"RuntimeError:Python版本> = 3.5必需". [英] Installing NumPy + SciPy in Python 2.7 now fails with "RuntimeError: Python version >= 3.5 required"

问题描述

从这样的源代码安装numpy和scipy(例如，在新的Python 2.7 pyenv virtualenv中):

Installing numpy and scipy from source like this (say, in a fresh Python 2.7 pyenv virtualenv):

pip install numpy==1.14.6 scipy==1.0.1 --no-binary numpy,scipy

让他们的安装程序使用指向我的openblas安装的~/.numpy-site.cfg文件.

gets their installers to use a ~/.numpy-site.cfg file that points to my openblas installation.

这曾经起作用.现在，它会生成一个长堆栈跟踪，结尾为:

This used to work. Now it produces a long stack trace ending with:

      File "/usr/local/var/pyenv/versions/2.7.16/envs/issue/lib/python2.7/site-packages/setuptools/sandbox.py", line 45, in _execfile
        exec(code, globals, locals)
      File "/var/folders/_b/q30qg_l50b5gvqd8y4_wb9h00000gn/T/easy_install-o9MJ5E/numpy-1.17.1/setup.py", line 31, in <module>
        if sys.version_info[0] < 3:
    RuntimeError: Python version >= 3.5 required.
    ----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

问发生了什么变化?
问:为什么在python 2.7安装中会显示Python version >= 3.5 required.?
问:如何解决?

Q. What changed?
Q. Why does it say Python version >= 3.5 required. in a Python 2.7 installation?
Q. How to fix it?

推荐答案

scipy 1.0.1安装程序需要numpy作为先决条件，但是多个安装程序一起工作最终得到了最新版本的numpy ，除非已经存在numpy.

The scipy 1.0.1 installer requires numpy as a prerequisite, but the multiple installers working together end up getting the latest version of numpy unless numpy is already present.

发生了什么变化:最新版本的numpy需要Python 3.5+，因此会出现错误消息.

What changed: The latest version of numpy requires Python 3.5+, hence the error message.

因此，即使pip命令明确要求install numpy==1.14.6 scipy==1.0.1，它也会触发更新的numpy安装程序，该安装程序在Python 2上失败.(堆栈跟踪中的最后一项显示numpy-1.17.1需要Python 3.)

So even though the pip command explicitly asked to install numpy==1.14.6 scipy==1.0.1, it triggers a newer numpy installer that fails on Python 2. (The last entry in the stack trace shows numpy-1.17.1 requiring Python 3.)

问题出现在pip，scipy和numpy安装程序以及easy_install之间的交互中. pip问题#6945 中的详细信息.

The problem arises in the interaction between pip, the scipy and numpy installers, and easy_install. Details in pip issue #6945.

解决方法::首先安装numpy.然后安装scipy.另外，如果您不需要--no-binary选项，则可以单行安装.

Workaround: Install numpy first. Then install scipy. Alternatively, the one-line install might work if you don't need the --no-binary option.

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