如何正确导入 numpy？

Question

我正在使用 qiskit（我是一个绝对的初学者，有一定的 Java 经验并且了解基本的 python）但是当我尝试运行一个使用 numpy 的示例代码时，它给了我这个错误。我尝试重新安装它，但它给了我同样的错误。

我已经尝试安装并重新安装它，但它没有工作

import numpy as np
from cqc.pythonLib import CQCConnection, qubit
from qiskit import QuantumCircuit, ClassicalRegister, QuantumRegister, execute
from qiskit.tools.visualization import circuit_drawer
from qiskit.quantum_info import state_fidelity
from qiskit import BasicAer

Traceback (most recent call last):
  File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/core/__init__.py", line 40, in <module>
    from . import multiarray
  File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/core/multiarray.py", line 12, in <module>
    from . import overrides
  File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/core/overrides.py", line 6, 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 "/home/nikhil/.local/lib/python3.6/site-packages/fghjkl.py", line 1, in <module>
    import numpy as np
  File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/__init__.py", line 142, in <module>
    from . import core
  File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/core/__init__.py", line 71, in <module>
    raise ImportError(msg)
ImportError: 

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

Importing the multiarray numpy extension module failed.  Most
likely you are trying to import a failed build of numpy.
Here is how to proceed:
- If you're working with a numpy git repository, try `git clean -xdf`
  (removes all files not under version control) and rebuild numpy.
- If you are simply trying to use the numpy version that you have installed:
  your installation is broken - please reinstall numpy.
- If you have already reinstalled and that did not fix the problem, then:
  1. Check that you are using the Python you expect (you're using /usr/bin/python3.7),
     and that you have no directories in your PATH or PYTHONPATH that can
     interfere with the Python and numpy versions 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

     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'

Answer 1

尝试升级numpy：

pip install --upgrade numpy

或卸载并重新安装：

pip uninstall numpy
pip install numpy