是否可以从 Anaconda 将 numpy 导入 Python 3.9？

Question

I have a question about using numpy library. A couple of months ago, I downloaded Anaconda, which gives numpy automatically. I am trying to use numpy by importing from ANaconda to Python. WHat I have done is: I added the package of numpy from Anaconda folder to Python folder. However, the python shell says that

  File "C:\Users\Alice Jun\Desktop\Python 3.9\numpy\core\__init__.py", line 22, in <module>
    from . import multiarray
  File "C:\Users\Alice Jun\Desktop\Python 3.9\numpy\core\multiarray.py", line 12, in <module>
    from . import overrides
  File "C:\Users\Alice Jun\Desktop\Python 3.9\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 "C:\Users\Alice Jun\Desktop\Python 3.9\gui.py", line 2, in <module>
        import numpy as np
      File "C:\Users\Alice Jun\Desktop\Python 3.9\numpy\__init__.py", line 140, in <module>
        from . import core
      File "C:\Users\Alice Jun\Desktop\Python 3.9\numpy\core\__init__.py", line 48, in <module>
        raise ImportError(msg)

What should I do to import numpy? Thank you and stay safe!

Answer 1

As others mentioned, that is not a proper way of installing a package. You are making a copy anyway, so install it through proper routes, eg,

# where `python` is the one you wish to use
python -m pip install numpy

Otherwise, the reason why what OP shows did not work is because packages are located under a site-packages directory (search under your Python 3.9/ directory. If one really wants to manually install a package, that's where it goes.

However, be aware that Conda packages make heavy use of dynamic linking in order to minimize redundancy of common dependencies. This is often done through @rpath specifications, which means moving packages out of their Conda environment path will frequently result in non-functionality.