appcfg.py不是在命令行

Question

工作，我只是有一點麻煩理解爲什麼這個命令：

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

由試用谷歌應用程序引擎現在頁面給出不起作用。我已經下載了適用於Python的App Engine SDK，並將Path設置爲指向appcfg.py的位置，但在項目根目錄中運行appcfg.py在命令行中不起作用。我要麼必須瀏覽到包含appcfg.py的文件夾，並做

>python appcfg.py help 

或做

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

得到命令在任何地方工作。我使用後一種方法來部署我的測試應用程序，但只是想知道是否有人能解釋爲什麼簡單的Google教程給出的命令沒有做任何事情。我還檢查只需輸入

>hello.py 

確保.py文件會自動使用Python 2.7解釋器打開，使得文件hello.py將在命令行中執行，它會輸出它的打印語句。在另一方面，以類似的方式使用appcfg.py提供同樣的輸出不管參數（請注意我截斷輸出，但放心，它們是相同的，不管參數：

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. 

Answer 1

你的困惑大概是從2種可能的調用風格混合了莖：

1. python appcfg.py ...
2. appcfg.py ...

釷Ë一日一不能使用的事實appcfg.py的位置是在路徑，它只是一個參數傳遞給python可執行文件，除非要麼無法找到appcfg.py文件：

• 發現它在當前目錄
• 的appcfg.py文件使用完整路徑或相對於從python調用

這對於你的第二個和第三個命令不要」的原因當前工作目錄的路徑指定不像你期望的那樣工作。如果appcfg.py的位置在路徑中，則使用第二種調用樣式應該可以工作 - 就像您上次執行的命令一樣。

關鍵點要記住：路徑配置適用於可執行的命令而已，並不是它的參數（這BTW每個可執行文件可以處理，因爲它希望，一些可執行可以與路徑配置，以獲得位置結合參數的文件）。

同樣，appcfg.py本身（一次使用2種調用樣式中的任何一種調用成功）需要能夠找到指定爲參數的app.yaml文件。它不能這樣做，除非兩種：

• 它發現它在使用完整路徑或相對於當前工作目錄的路徑從appcfg.py是指定了當前目錄
• 的app.yaml文件（或它的目錄）調用

我懷疑appcfg.py的無法找到您app.yaml文件可能是你提到的1號命令沒有工作的原因。如果不是，你應該提供有關失敗的細節。

關於爲什麼最後一條命令的輸出與參數無關，我不確定，它可能是SDK的Windows版本中的一個錯誤。在linux中，輸出是不同的：

> 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. 

Answer 2

我終於找到了真正的原因，它不是AppEngine SDK的錯誤。而是我的Python解釋器，因爲我注意到它沒有接受任何.py文件的參數。它原來是一個註冊表錯​​誤，位於[HKEY_CLASSES_ROOT\Applications\python.exe\shell\open\command]，我必須從"C:\Python27\python.exe" "%1"值更改爲"C:\Python27\python.exe" "%1" %*

這是怎麼發生的，無論是在Python 2.7版的安裝程序，或者也許是AppEngine上SDK ，但我不確定。