title: How can I import numpy correctly?
body: <p>I am using qiskit (I am an absolute beginner with some experience with Java and know basic python) but when I tried to run an example code which uses numpy it gave me this error. I tried reinstalling it but it gave me the same error. </p>
  
  <p>I have tried installing and reinstalling it but it didnt work</p>
  
  <pre><code>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 &lt;module&gt;
      from . import multiarray
    File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/core/multiarray.py", line 12, in &lt;module&gt;
      from . import overrides
    File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/core/overrides.py", line 6, in &lt;module&gt;
      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 &lt;module&gt;
      import numpy as np
    File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/__init__.py", line 142, in &lt;module&gt;
      from . import core
    File "/home/nikhil/.local/lib/python3.6/site-packages/numpy/core/__init__.py", line 71, in &lt;module&gt;
      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'
  </code></pre>