模块未找到错误，但路径在PYTHONENV和sys.path中

我有以下项目结构：

airflow_ci
  plugins
    sql_operator.py
  utilities
    __init__.py
    db.py

我想从

sql\u operator.py

导入

db.py

中的函数

get\u primary\u keys

。为此，我编写了代码：

from utilities.db import get_primary_keys

此外，我还添加了PYTHONENV的路径：

export PYTHONENV=/home/ubuntu/airflow_ci/utilities

如果我做了

printenv PYTHONENV

我会得到以下结果：

/home/ubuntu/airflow_ci/utilities

['', '/home/ubuntu/airflow_ci/utilities', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/ubuntu/.local/lib/python3.6/site-packages', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages']

输入python并打印sys.path后，我得到以下信息：

/home/ubuntu/airflow_ci/utilities

['', '/home/ubuntu/airflow_ci/utilities', '/usr/lib/python36.zip', '/usr/lib/python3.6', '/usr/lib/python3.6/lib-dynload', '/home/ubuntu/.local/lib/python3.6/site-packages', '/usr/local/lib/python3.6/dist-packages', '/usr/lib/python3/dist-packages']

尽管如此，我还是得到了一个错误：

Traceback (most recent call last):
  File "/home/ubuntu/.local/lib/python3.6/site-packages/airflow/plugins_manager.py", line 182, in <module>
    m = imp.load_source(namespace, filepath)
  File "/usr/lib/python3.6/imp.py", line 172, in load_source
    module = _load(spec)
  File "<frozen importlib._bootstrap>", line 684, in _load
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/ubuntu/airflow_ci/plugins/sql_operator.py", line 2, in <module>
    from utilities.db import get_primary_keys_query
ModuleNotFoundError: No module named 'utilities'

不在sql_operator.py中添加

sys.append

代码行，是否可以解决此问题