在没有 pip/anaconda 的 Ubuntu 上安装 numpy

Question

Without using anaconda or pip , while installing numpy on Ubuntu and printing numpy version, i get this:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/numpy/core/__init__.py", line 17, in <module>
    from . import multiarray
  File "/usr/lib/python3/dist-packages/numpy/core/multiarray.py", line 14, in <module>
    from . import overrides
  File "/usr/lib/python3/dist-packages/numpy/core/overrides.py", line 7, in <module>
    from numpy.core._multiarray_umath import (
ModuleNotFoundError: No module named 'numpy.core._multiarray_umath'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "basicVersions.py", line 2, in <module>
    import numpy as np
  File "/usr/lib/python3/dist-packages/numpy/__init__.py", line 142, in <module>
    from . import core
  File "/usr/lib/python3/dist-packages/numpy/core/__init__.py", line 47, in <module>
    raise ImportError(msg)
ImportError: 

IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

Importing the numpy c-extensions failed.
- Try uninstalling and reinstalling numpy.
- If you have already done that, then:
  1. Check that you expected to use Python3.7 from "/usr/bin/python3.7",
     and that you have no directories in your PATH or PYTHONPATH that can
     interfere with the Python and numpy version "1.17.4" you're trying to use.
  2. If (1) looks fine, you can open a new issue at
     https://github.com/numpy/numpy/issues.  Please include details on:
     - how you installed Python
     - how you installed numpy
     - your operating system
     - whether or not you have multiple versions of Python installed
     - if you built from source, your compiler versions and ideally a build log

- If you're working with a numpy git repository, try `git clean -xdf`
  (removes all files not under version control) and rebuild numpy.

Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.

Original error was: No module named 'numpy.core._multiarray_umath'

在所有论坛上，给出的安装步骤都是在 pip/anaconda 的上下文中。 我没有找到很多关于通过 apt/apt-get 在 Ubuntu 上安装的参考资料。 这看起来像安装错误，所以我也尝试了这个，但没有运气。 请帮忙！

sudo apt install numpy
Reading package lists... Done
Building dependency tree       
Reading state information... Done
E: Unable to locate package numpy
~/python$ sudo apt install python3-numpy
Reading package lists... Done
Building dependency tree       
Reading state information... Done
python3-numpy is already the newest version (1:1.17.4-5ubuntu3).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

这可能是 python 版本问题吗？ 这是我正在尝试的代码：

import sys
import numpy as np
import matplotlib

print("Python: ", sys.version)
print("Numpy: ", np.__version__)
print("Matplotlib: ", matplotlib.__version__)

Answer 1

解决方案是使用python3作为命令而不是python3.7问题可以用这个结论标记为关闭。