启动时dev_appserver.py失败

Question

当启动本地开发服务器时出现以下错误：dev_appserver.py。

$ dev_appserver.py app.yaml 
INFO  2017-07-03 06:51:09,662 devappserver2.py:116] Skipping SDK update check. 
Traceback (most recent call last): 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 103, in <module> 
    _run_file(__file__, globals()) 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/dev_appserver.py", line 97, in _run_file 
    execfile(_PATHS.script_file(script_name), globals_) 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 381, in <module> 
    main() 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 369, in main 
    dev_server.start(options) 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/devappserver2.py", line 176, in start 
    configuration.modules[0].application_root, datastore_emulator_host) 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/api_server.py", line 524, in create_api_server 
    appidentity_oauth_url=options.appidentity_oauth_url) 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/google/appengine/tools/devappserver2/api_server.py", line 699, in setup_stubs 
    oauth_url=appidentity_oauth_url) 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/google/appengine/api/app_identity/app_identity_stub.py", line 198, in Create 
    import six 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/lib/six-1.9.0/six/__init__.py", line 825, in <module> 
    from . import test_six 
    File "/home/daniel/google-cloud-sdk/platform/google_appengine/lib/six-1.9.0/six/test_six.py", line 105, in <module> 
    @py.test.mark.parametrize("item_name", 
AttributeError: 'NoneType' object has no attribute 'parametrize' 

版本：

$ gcloud --version 
Google Cloud SDK 161.0.0 
app-engine-python 1.9.55 
beta 2017.03.24 
bq 2.0.24 
core 2017.06.26 
gcloud 
gsutil 4.26 

Answer 1

的gcloud-sdk组件app-engine-python==1.9.55 vendored six==1.9.0库似乎是依赖于pytest。

问题是由安装固定pytest

$ pip install pytest 

见问题：https://issuetracker.google.com/issues/62980070

Answer 2

这只能是谁拥有pytest版本< 2.2.0本地安装，在目前的版本是用户的问题3.1.3。如果（a）没有安装pytest或（b）安装pytest> = 2.2.0，用户将不会看到此问题。在2.2.0中引入了堆栈跟踪结尾的@ py.test.mark.parametrize（）装饰器。

我们已经提交了一个补丁程序，可以解决此问题，以便pytest < 2.2.0的用户可以在下一个App Engine SDK版本中使用。同时，用户可以在本地升级他们的pytest版本，问题应该消失。