你可能需要升级pip，它对我有用

pip install --upgrade pip
pip install -U numpy

所有这些不同的答案都表明出现了许多不同的问题，例如ImportError: numpy.core.multiarray导入失败。

==>所以在堆栈回溯之前查找更多的错误信息

例如，重现一个这样的问题的步骤(这些步骤在numpy 1.20发布之前都很好):

# set up a virtualenv
pyenv virtualenv 3.8.7 pip-issue-9542
pyenv local pip-issue-9542

# update pip, setuptools
pip install -U pip setuptools

# install 2 pips
pip install --no-cache-dir numpy==1.19.5 cvxpy==1.1.3

# try to load cvxpy
python -c 'import cvxpy'

输出:

RuntimeError: module compiled against API version 0xe but this version of numpy is 0xd
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/__init__.py", line 18, in <module>
    from cvxpy.atoms import *
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/__init__.py", line 20, in <module>
    from cvxpy.atoms.geo_mean import geo_mean
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/geo_mean.py", line 20, in <module>
    from cvxpy.utilities.power_tools import (fracify, decompose, approx_error, lower_bound,
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/utilities/power_tools.py", line 18, in <module>
    from cvxpy.atoms.affine.reshape import reshape
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/affine/reshape.py", line 18, in <module>
    from cvxpy.atoms.affine.hstack import hstack
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/affine/hstack.py", line 18, in <module>
    from cvxpy.atoms.affine.affine_atom import AffAtom
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/atoms/affine/affine_atom.py", line 22, in <module>
    from cvxpy.cvxcore.python import canonInterface
  File "/usr/local/var/pyenv/versions/pip-issue-9542/lib/python3.8/site-packages/cvxpy/cvxcore/python/__init__.py", line 3, in <module>
    import _cvxcore
ImportError: numpy.core.multiarray failed to import

重要的线索是RuntimeError:模块根据API版本0xe编译，但numpy的这个版本是0xd。

搜索它可以让你找到pip issue 9542和cvxpy issue 1229，它们解释了哪里出了问题。

本例中的变通方法是(a)更新为cvxpy>=1.1.10，或(b)更新为numpy>=1.20，或(c)两者都更新。您必须处理库更改，因为如果不深入pip的“无构建隔离”世界，原始环境是不可复制的。

这对我很管用。因此，您可以尝试以下命令

$ pip install numpy -I

我得到了同样的错误，并能够通过更新我的numpy安装到1.8.0来解决它:

pip install -U numpy

我有同样的错误信息，在尝试了一些建议的解决方案没有成功后，我发现我需要运行:

pip uninstall numpy

很多次了。每次都有几个不同的文件被标记为要删除，这些文件来自系统中积累的不同版本的numpy。

一旦没有东西可以卸载了，问题就来了

pip install numpy

希望这能帮助到一些人!

我得到了同样的错误，通过将我的numpy安装从1.7.1更新到1.12.1，问题得到了解决

pip install -U numpy

以下是错误发生时我的cmd序列， 与上面略有不同:

$ python

Python 2.7.12 |Anaconda 4.2.0 (x86_64)| (default, Jul  2 2016, 17:43:17) 

[GCC 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)] on darwin

Type "help", "copyright", "credits" or "license" for more information.

Anaconda is brought to you by Continuum Analytics.

Please check out: http://continuum.io/thanks and https://anaconda.org

>>> import cv2

>>> import numpy as np

>>> from matplotlib import pyplot as plt