如何使用Google App Engine Python将变量从app.yaml传递到main.py.

Question

I am trying to pass some configuration variables to my main.py from app.yaml. I haven't been able to locate the syntax for accessing app.yaml from the code.

For example you want to have the user put their client number in app.yaml and access it from main.py to pass into main.html. While it would be easy to create a variable in main.py to pass it, it seems to be something that would be better put into app.yaml.

Example:

app.yaml

    application: xyz
    version: 1
    runtime: python27
    ...
    clientID: (ID here)

main.py

    myID = appYAML.clientID
    ...
    values = {'xyz': blah.blah, 'myID': myID }

main.html

    ...
    <script>
      ...
      {% ifequal myID %}
        my_client = {{myID}}
      ...
    </script>

Answer 1

With the 1.6.5 release, App Engine support this[1]:

- In your app.yaml file, you can include an env_variables stanza that will set
  the given environment variables in your application's runtime.

Information on how to use this is available at: https://cloud.google.com/appengine/docs/python/config/appconfig#Python_app_yaml_Defining_environment_variables .

Answer 2

这不受支持，您应该将特定于应用程序的设置放入您自己的YAML文件中。

Answer 3

You can define variables in app.yaml to make them available to the program's os.environ dictionary:

env_variables:
  variable_name: '<YOUR VALUE>'

When you need to use this variable within the main.py you can call it in this way:

import os
CUSTOM_SETTINGS = os.environ['variable_name']

Documentation: https://developers.google.com/appengine/docs/python/config/appconfig#Python_app_yaml_Defining_environment_variables