我有一个问题。我正在使用Windows 7 32x，Python 3.
当我试图在代码中导入numpy库时，无论如何，我都会得到一个错误，我不记得如何解决它。
代码本身：

import numba

print('Hello World!')

这里是错误：

Traceback (most recent call last):
  File "C:\Users\User\Desktop\numba_test.py", line 1, in <module>
    import numba
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\__init__.py", line 38, in <module>
    from numba.core.decorators import (cfunc, generated_jit, jit, njit, stencil,
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\core\decorators.py", line 12, in <module>
    from numba.stencils.stencil import stencil
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\stencils\stencil.py", line 11, in <module>
    from numba.core import types, typing, utils, ir, config, ir_utils, registry
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\core\registry.py", line 4, in <module>
    from numba.core import utils, typing, dispatcher, cpu
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\core\dispatcher.py", line 13, in <module>
    from numba.core import (
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\core\compiler.py", line 6, in <module>
    from numba.core import (utils, errors, typing, interpreter, bytecode, postproc,
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\core\cpu.py", line 15, in <module>
    import numba.core.entrypoints
  File "C:\Users\User\AppData\Roaming\Python\Python37\site-packages\numba\core\entrypoints.py", line 8, in <module>
    import importlib_metadata
ValueError: source code string cannot contain null bytes

我已经重新安装了几次numba，在互联网上搜索解决方案，但都没有成功。尽你所能帮助。