从自定义目录导入python库

Question

我正在安装许多python包

pip install -r requirements.txt -t lib

我还创建了 init 文件 但是我遇到这样的错误

>>> import libs
>>> import libs.numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "libs/numpy/__init__.py", line 151, in <module>
    from .testing import Tester, _numpy_tester
  File "libs/numpy/testing/__init__.py", line 12, in <module>
    from . import decorators as dec
  File "libs/numpy/testing/decorators.py", line 6, in <module>
    from .nose_tools.decorators import *
  File "libs/numpy/testing/nose_tools/decorators.py", line 20, in <module>
    from .utils import SkipTest, assert_warns
  File "libs/numpy/testing/nose_tools/utils.py", line 18, in <module>
    from numpy.core import(
ImportError: cannot import name isnat
>>>
>>> import libs.numpy
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "libs/numpy/__init__.py", line 142, in <module>
    from . import add_newdocs
ImportError: cannot import name add_newdocs

我无法导入任何软件包。有依赖性问题吗？