输入“import numpy”，出现以下，是为什么呢：

Traceback (most recent call last):

  File "C:\Users\fangjiali\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\core\__init__.py", line 16, in <module>

    from . import multiarray

ImportError: DLL load failed: 找不到指定的程序。

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

  File "<pyshell#0>", line 1, in <module>

    import numpy as np

  File "C:\Users\fangjiali\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\__init__.py", line 142, in <module>

    from . import add_newdocs

  File "C:\Users\fangjiali\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\add_newdocs.py", line 13, in <module>

    from numpy.lib import add_newdoc

  File "C:\Users\fangjiali\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\lib\__init__.py", line 8, in <module>

    from .type_check import *

  File "C:\Users\fangjiali\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\lib\type_check.py", line 11, in <module>

    import numpy.core.numeric as _nx

  File "C:\Users\fangjiali\AppData\Local\Programs\Python\Python36\lib\site-packages\numpy\core\__init__.py", line 26, in <module>

    raise ImportError(msg)

ImportError: 

Importing the multiarray numpy extension module failed.  Most

likely you are trying to import a failed build of numpy.

If you're working with a numpy git repo, try `git clean -xdf` (removes all

files not under version control).  Otherwise reinstall numpy.

Original error was: DLL load failed: 找不到指定的程序。