设置 Flask 以对每个环境进行单独配置时不存在的路径

Question

我为每个环境和一个应用程序分开了配置，目录树如下所示：

myapp
??? __init__.py         # empty
??? config
?   ??? __init__.py     # empty
?   ??? development.py
?   ??? default.py
?   ??? production.py
??? instance
?   ??? config.py
??? myapp
   ??? __init__.py
   ??? myapp.py

代码

相关代码，myapp/__init__.py：

from flask import Flask

app = Flask(__name__, instance_relative_config=True)
app.config.from_object('config.default')
app.config.from_pyfile('config.py')
app.config.from_envvar('APP_CONFIG_FILE')

myapp/myapp.py：

from myapp import app
# ...

命令

然后我设置变量：

$export FLASK_APP=myapp.py

并尝试从项目根目录运行开发服务器：

$ flask run
Usage: flask run [OPTIONS]

Error: The file/path provided (myapp.py) does not appear to exist.  Please verify the path is correct.  If app is not on PYTHONPATH, ensure the extension is .py

从项目myapp文件夹中：

$ cd myapp
$ flask run
Usage: flask run [OPTIONS]

Error: The file/path provided (myapp.myapp.myapp) does not appear to exist.  Please verify the path is correct.  If app is not on PYTHONPATH, ensure the extension is .py

使用另一个FLASK_APP变量：

$ export FLASK_APP=myapp/myapp.py
# in project root
$ flask run
Usage: flask run [OPTIONS]

Error: The file/path provided (myapp.myapp.myapp) does not appear to exist.  Please verify the path is correct.  If app is not on PYTHONPATH, ensure the extension is .py
# moving to project/myapp
$ cd myapp
$ flask run
Usage: flask run [OPTIONS]

Error: The file/path provided (myapp/myapp.py) does not appear to exist.  Please verify the path is correct.  If app is not on PYTHONPATH, ensure the extension is .py

其他测试不成功

$ python -c 'import myapp; print(myapp)'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/user/myapp/myapp/__init__.py", line 6, in <module>
    app.config.from_envvar('APP_CONFIG_FILE')
  File "/home/user/.virtualenvs/myapp/lib/python3.5/site-packages/flask/config.py", line 108, in from_envvar
    variable_name)
RuntimeError: The environment variable 'APP_CONFIG_FILE' is not set and as such configuration could not be loaded.  Set this variable and make it point to a configuration file

$ export APP_CONFIG_FILE="/home/user/myapp/config/development.py"
$ python -c 'import myapp; print(myapp)'<module 'myapp' from '/home/user/myapp/myapp/__init__.py'>
$ flask run
Usage: flask run [OPTIONS]
Error: The file/path provided (myapp.myapp) does not appear to exist.  Please verify the path is correct.  If app is not on PYTHONPATH, ensure the extension is .py

笔记：

• 我没有使用PYTHON_PATH变量，它是空的

• 我已经看到其他相关问题（Flask: How to manage different environment databases?）但我的问题是（相关的新）flask命令

• 使用 Python 3.5.2+

Answer 1

我花了一段时间，但我终于找到了：

1. Flask 不喜欢__init__.py根级别为 delete 的项目myapp/__init__.py。这是位于根文件夹中的那个：

   myapp
   ??? __init__.py     <--- DELETE
   ...
   ??? myapp
       ??? __init__.py  <--- keep
       ??? myapp.py
   

2. 用 $ export FLASK_APP=myapp/myapp.py

3. 指定配置的环境变量应该是它的绝对路径：export APP_CONFIG_FILE="/home/user/myapp/config/development.py"

现在一切正常 \o/

$ flask run
* Serving Flask app "myapp.myapp"
* Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)

$ flask shell
Python 3.5.2+ (default, Sep 22 2016, 12:18:14) 
[GCC 6.2.0 20160927] on linux
App: myapp
Instance: /home/user/myapp/instance
>>>