Miscellaneous

Module Import in Python

For a package structure as following:

package
├── __init__.py
├── subpackage1
│   ├── __init__.py
│   ├── moduleX.py
│   └── moduleY.py
├── subpackage2
│   ├── __init__.py
│   └── moduleZ.py
└── moduleA.py

Assuming you execute the following command under package

1. python subpackage1/moduleX.py   
2. python -m subpackage1.moduleX

The first one will import modules from sys.path. A ModuleNotFound error raises if the desired one is not in sys.path. So if moduleX.py import function in moduleZ.py, it may cause error since the sys.path may only contains xxx/package/subpackage1

Instead, the second one will first import the desired package or module, then execute the script.