spyder中第二个库导入时出现KeyError / frozen importlib._bootstrap错误

Question

我收到了

File " <frozen importlib._bootstrap_external> ", line 978, in _get_parent_path    
KeyError: 'python_library'

我第二次在spyder中从子文件夹导入库时出错，但是第一次（在重新启动spyder之后）或spyder之外它工作正常。

代码是：

from python_library.tools.test_lib import test_func    
test_func()

其中test_lib.py就是这样

def test_func():    
    print('Hello!')

输出是：

runfile('/home/user/Desktop/test.py', wdir='/home/user/Desktop')
Hello!

runfile('/home/user/Desktop/test.py', wdir='/home/user/Desktop')    
Reloaded modules: python_library, python_library.tools.test_lib
Traceback (most recent call last):

  File "< ipython-input-2-e750fd08988c >", line 1, in <module>   
    runfile('/home/user/Desktop/test.py', wdir='/home/user/Desktop')

  File "/home/user/anaconda3/envs/qutip/lib/python3.6/site-packages/spyder_kernels/customize/spydercustomize.py", line 678, in runfile    
    execfile(filename, namespace)

  File "/home/user/anaconda3/envs/qutip/lib/python3.6/site-packages/spyder_kernels/customize/spydercustomize.py", line 106, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "/home/user/Desktop/test.py", line 1, in <module>
    from python_library.tools.test_lib import test_func

  File "<frozen importlib._bootstrap>", line 971, in _find_and_load

  File "<frozen importlib._bootstrap>", line 951, in _find_and_load_unlocked

  File "<frozen importlib._bootstrap>", line 894, in _find_spec

  File "<frozen importlib._bootstrap_external>", line 1157, in find_spec

  File "<frozen importlib._bootstrap_external>", line 1123, in _get_spec

  File "<frozen importlib._bootstrap_external>", line 994, in __iter__

  File "<frozen importlib._bootstrap_external>", line 982, in _recalculate

  File "<frozen importlib._bootstrap_external>", line 978, in _get_parent_path

KeyError: 'python_library'

当库不在子文件夹中时不会发生错误，即

from python_library.test_lib2 import test_func

经常任意运行。但是我有足够的功能，没有子文件夹会非常烦人。

这是spyder-3.3.2，但它也发生在Spyder版本3.3.0-py36_1之前。 python版本是3.6.4。，spyder通过anaconda安装和更新，'python_library'通过setup.py安装（setuptools版本40.6.3，也发生在版本39.2.0-py36_0）。

注意：问题How do I solve a KeyError when importing a python module?发生了同样的错误，但该问题没有答案，也没有spyder标签。

Answer 1

解决方案是子文件夹工具中没有空的__init__.py文件，只在超级文件夹python_library中。将文件__init__.py添加到工具中使其工作。

Answer 2

命令行：

cd your_python_file_position
touch __init__.py