《Flask Web开发》学习笔记之bug--（7）【ImportError: cannot import name 'db'】

工程结构：

$ pwd;ls/home/henry/dev/Flask_Web_Python_Henry/flask_henryapp        manage.py   __pycache__       tests  venv_henry_0717config.py  migrations  requirements.txt  venv

$ pwd;ls/home/henry/dev/Flask_Web_Python_Henry/flask_henry/appemail.py   main       __pycache__  templates_init_.py  models.py  static

报错信息：

$ python3 manage.py shellTraceback (most recent call last):  File "manage.py", line 3, in <module>    from app.models import User, Role  File "/home/henry/dev/Flask_Web_Python_Henry/flask_henry/app/models.py", line 3, in <module>    from . import dbImportError: cannot import name 'db'

没有在Google或者Stack Overflow找到合适的解决办法，对比原书作者的代码，发现问题出在_init_.py的文件名，应当为__init__.py。