在沒有 pip/anaconda 的 Ubuntu 上安裝 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'

在所有論壇上，給出的安裝步驟都是在 pip/anaconda 的上下文中。 我沒有找到很多關於通過 apt/apt-get 在 Ubuntu 上安裝的參考資料。 這看起來像安裝錯誤，所以我也嘗試了這個，但沒有運氣。 請幫忙！

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.

這可能是 python 版本問題嗎？ 這是我正在嘗試的代碼：

import sys
import numpy as np
import matplotlib

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

Answer 1

解決方案是使用python3作為命令而不是python3.7問題可以用這個結論標記為關閉。