启动Google App Engine本地服务器遇WindowsError[2]文件未找到问题

执行的启动命令 #

python3 "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin\dev_appserver.py" "C:\Users\myusername\Desktop\test_gae_python3\app.yaml"

异常日志 #

INFO     2023-02-15 23:27:07,500 devappserver2.py:317] Skipping SDK update check.
INFO     2023-02-15 23:27:07,720 <string>:384] Starting API server at: http://localhost:50618
INFO     2023-02-15 23:27:07,747 instance_factory.py:155] Detected python version "Python 3.9.13
" for runtime "python39" at "python3".
Actual environment location may have moved due to redirects, links or junctions.
  Requested location: "c:\users\myuser~1\appdata\local\temp\tmp2cocmu\Scripts\python3.exe"
  Actual location:    "C:\Users\myusername\AppData\Local\Temp\tmp2cocmu\Scripts\python3.exe"
INFO     2023-02-15 23:27:17,122 instance_factory.py:312] Using pip to install dependency libraries; pip stdout is redirected to c:\users\myuser~1\appdata\local\temp\tmpsvzpsq
INFO     2023-02-15 23:27:17,154 instance_factory.py:334] Running c:\users\myuser~1\appdata\local\temp\tmp2cocmu\bin\pip install --upgrade pip
INFO     2023-02-15 23:27:17,155 stub_util.py:360] Applying all pending transactions and saving the datastore
INFO     2023-02-15 23:27:17,157 stub_util.py:363] Saving search indexes
Traceback (most recent call last):
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\dev_appserver.py", line 109, in <module>
    _run_file(__file__, globals())
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\dev_appserver.py", line 103, in _run_file
    _execfile(_PATHS.script_file(script_name), globals_)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\dev_appserver.py", line 83, in _execfile
    execfile(fn, scope)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\devappserver2.py", line 645, in <module>
    main()
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\devappserver2.py", line 633, in main
    dev_server.start(options)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\devappserver2.py", line 401, in start
    options.api_host, apiserver.port, wsgi_request_info_)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\dispatcher.py", line 272, in start
    ssl_port)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\dispatcher.py", line 409, in _create_module
    ssl_port=ssl_port)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\module.py", line 1356, in __init__
    super(AutoScalingModule, self).__init__(**kwargs)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\module.py", line 615, in __init__
    self._module_configuration)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\module.py", line 242, in _create_instance_factory
    module_configuration=module_configuration)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\python\instance_factory.py", line 207, in __init__
    self._SetupVirtualenvFromConfiguration()
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\python\instance_factory.py", line 233, in _SetupVirtualenvFromConfiguration
    self._venv_dir, self._OrigRequirementsFile)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\python\instance_factory.py", line 359, in _SetupVirtualenv
    self._RunPipInstall(venv_dir, requirements_file_name)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\google_appengine\google\appengine\tools\devappserver2\python\instance_factory.py", line 335, in _RunPipInstall
    pip_proc = subprocess.Popen(pip_cmd, stdout=pip_out, env=pip_env)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\bundledpython2\lib\subprocess.py", line 390, in __init__
    errread, errwrite)
  File "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\platform\bundledpython2\lib\subprocess.py", line 640, in _execute_child
    startupinfo)
WindowsError: [Error 2] The system cannot find the file specified

配置文件与代码 #

app.yaml #

runtime: python39
app_engine_apis: true
service: default
entrypoint: python3 -m app

app.py #

print('OK')

当前环境信息 #

• Windows 11 Pro (22621.1265)
• Python 3.9.13
• Google Cloud SDK 418.0.0
• app-engine-python 1.9.101
• bq 2.0.85
• cloud-datastore-emulator 2.3.0
• core 2023.02.13
• gsutil 5.20

已尝试回退SDK至367.0.0，问题依旧；系统仅安装Python 3.9.13，无其他版本。

解决方法 #

1. 跳过依赖检查 #

由于测试项目没有额外依赖，直接添加--skip_requirements_check参数跳过pip安装步骤，修改启动命令为：

python3 "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin\dev_appserver.py" --skip_requirements_check "C:\Users\myusername\Desktop\test_gae_python3\app.yaml"

2. 指定完整Python路径 #

避免python3别名在虚拟环境中找不到，改用系统Python的完整路径启动：

"C:\Python39\python.exe" "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin\dev_appserver.py" "C:\Users\myusername\Desktop\test_gae_python3\app.yaml"

3. 修改app.yaml的entrypoint #

虚拟环境中默认Python命令为python而非python3，调整entrypoint：

entrypoint: python -m app

4. 手动指定虚拟环境 #

先在项目目录手动创建虚拟环境：

python3 -m venv venv
venv\Scripts\activate
pip install --upgrade pip
deactivate

启动时指定该虚拟环境的Python路径：

python3 "C:\Users\myusername\AppData\Local\Google\Cloud SDK\google-cloud-sdk\bin\dev_appserver.py" --python "C:\Users\myusername\Desktop\test_gae_python3\venv\Scripts\python.exe" "C:\Users\myusername\Desktop\test_gae_python3\app.yaml"

内容的提问来源于stack exchange，提问作者Dario