python-2.7 – appcfg.py无法在命令行中运行

我只是在理解为什么这个命令时遇到了一些麻烦：

>appcfg.py -A adept-box-109804 update app.yaml

由Try Google App Engine Now页面提供的功能不起作用.我已下载App Engine SDK for Python,并将Path设置为指向appcfg.py的位置,但在我的项目根目录中运行appcfg.py在命令行中不起作用.我要么导航到包含appcfg.py的文件夹并执行操作

>python appcfg.py help

或者做

>python "C:\Program Files (x86)\Google\google_appengine\appcfg.py" help

从任何地方获得命令.我使用后一种方法来部署我的测试应用程序,但只是想知道是否有人可以解释为什么简单的Google教程给出的命令没有做任何事情.我还检查了确保.py文件是使用Python 2.7解释器自动打开的,这样只需输入一个文件hello.py就可以在命令行中执行

>hello.py

它将输出其打印声明.另一方面,使用appcfg.py以类似的方式提供相同的输出,无论参数如何(请注意我截断了输出,但请放心,无论参数如何,它们都是相同的：

C:\>appcfg.py help backends
Usage: appcfg.py [options] <action>

Action must be one of:
  backends: Perform a backend action.
  backends configure: Reconfigure a backend without stopping it.
  backends delete: Delete a backend.
  backends list: List all backends configured for the app.
  backends rollback: Roll back an update of a backend.
  backends start: Start a backend.
  backends stop: Stop a backend.
  backends update: Update one or more backends.
  create_bulkloader_config: Create a bulkloader.yaml from a running application.
  cron_info: Display information about cron jobs.
  delete_version: Delete the specified version for an app.
  download_app: Download a previously-uploaded app.
  download_data: Download entities from datastore.
  help: Print help for a specific action.
  list_versions: List all uploaded versions for an app.
  request_logs: Write request logs in Apache common log format.
  resource_limits_info: Get the resource limits.
  rollback: Rollback an in-progress update.
  set_default_version: Set the default (serving) version.
  start_module_version: Start a module version.
  stop_module_version: Stop a module version.
  update: Create or update an app version.
  update_cron: Update application cron definitions.
  update_dispatch: Update application dispatch definitions.
  update_dos: Update application dos definitions.
  update_indexes: Update application indexes.
  update_queues: Update application task queue definitions.
  upload_data: Upload data records to datastore.
  vacuum_indexes: Delete unused indexes from application.
Use 'help <action>' for a detailed description.

C:\>appcfg.py help update
Usage: appcfg.py [options] <action>

Action must be one of:
  backends: Perform a backend action.
  backends configure: Reconfigure a backend without stopping it.
  backends delete: Delete a backend.
  backends list: List all backends configured for the app.
  backends rollback: Roll back an update of a backend.
  backends start: Start a backend.
  backends stop: Stop a backend.
  backends update: Update one or more backends.
  create_bulkloader_config: Create a bulkloader.yaml from a running application.
  cron_info: Display information about cron jobs.
  delete_version: Delete the specified version for an app.
  download_app: Download a previously-uploaded app.
  download_data: Download entities from datastore.
  help: Print help for a specific action.
  list_versions: List all uploaded versions for an app.
  request_logs: Write request logs in Apache common log format.
  resource_limits_info: Get the resource limits.
  rollback: Rollback an in-progress update.
  set_default_version: Set the default (serving) version.
  start_module_version: Start a module version.
  stop_module_version: Stop a module version.
  update: Create or update an app version.
  update_cron: Update application cron definitions.
  update_dispatch: Update application dispatch definitions.
  update_dos: Update application dos definitions.
  update_indexes: Update application indexes.
  update_queues: Update application task queue definitions.
  upload_data: Upload data records to datastore.
  vacuum_indexes: Delete unused indexes from application.
Use 'help <action>' for a detailed description.

您的混淆可能源于混合了两种可能的调用样式：

> python appcfg.py …
> appcfg.py …

第一个不能利用appcfg.py的位置在路径中的事实,它只是python可执行文件的参数,它无法找到appcfg.py文件,除非：

>它在当前目录中找到它
>使用完整路径或相对于调用python的当前工作目录的路径指定appcfg.py文件

这就是你的第二和第三个命令无法正常工作的原因.如果appcfg.py的位置在路径中,则使用第二个调用样式应该有效 – 就像上次命令调用一样.

需要记住的关键点：路径配置仅适用于命令可执行文件,而不适用于其参数(BTW每个可执行文件可以按照自己的意愿处理,一些可执行文件可以将参数与路径配置组合以获取文件的位置).

类似地,appcfg.py本身(一旦使用2种调用样式中的任何一种成功调用)需要能够找到指定为参数的app.yaml文件.除非有以下情况,否则不能这样做：

>它在当前目录中找到它
>使用完整路径或相对于当前工作目录的路径指定app.yaml文件(或其目录),从中调用appcfg.py

我怀疑appcfg.py无法找到你的app.yaml文件可能是你提到的第一个命令不起作用的原因.如果没有,您应该提供有关失败的详细信息.

关于为什么你的上一个命令的输出无论参数如何都是相同的,我不确定,它可能是SDK的Windows版本中的一个错误.在linux中,输出是不同的：

> appcfg.py help backends
Usage: appcfg.py [options] backends <directory> <action>

Perform a backend action.

The 'backends' command will perform a backends action.

Options:
  -h, --help            Show the help message and exit.
  -q, --quiet           Print errors only.
  -v, --verbose         Print info level logs.
  --noisy               Print all logs.
  -s SERVER, --server=SERVER
                        The App Engine server.
  -e EMAIL, --email=EMAIL
                        The username to use. Will prompt if omitted.
  -H HOST, --host=HOST  Overrides the Host header sent with all RPCs.
  --no_cookies          Do not save authentication cookies to local disk.
  --skip_sdk_update_check
                        Do not check for SDK updates.
  -A APP_ID, --application=APP_ID
                        Set the application, overriding the application value
                        from app.yaml file.
  -M MODULE, --module=MODULE
                        Set the module, overriding the module value from
                        app.yaml.
  -V VERSION, --version=VERSION
                        Set the (major) version, overriding the version value
                        from app.yaml file.
  -r RUNTIME, --runtime=RUNTIME
                        Override runtime from app.yaml file.
  -E NAME:VALUE, --env_variable=NAME:VALUE
                        Set an environment variable, potentially overriding an
                        env_variable value from app.yaml file (flag may be
                        repeated to set multiple variables).
  -R, --allow_any_runtime
                        Do not validate the runtime in app.yaml
  --oauth2              Ignored (OAuth2 is the default).
  --oauth2_refresh_token=OAUTH2_REFRESH_TOKEN
                        An existing OAuth2 refresh token to use. Will not
                        attempt interactive OAuth approval.
  --oauth2_access_token=OAUTH2_ACCESS_TOKEN
                        An existing OAuth2 access token to use. Will not
                        attempt interactive OAuth approval.
  --authenticate_service_account
                        Authenticate using the default service account for the
                        Google Compute Engine VM in which appcfg is being
                        called
  --noauth_local_webserver
                        Do not run a local web server to handle redirects
                        during OAuth authorization.