我尝试使用以下方法从Google下载我的代码：
appcfg.py download_app -A "canada-math" ./trunk3
我的主目录下安装了旧的appengine，您可以在下面的错误输出中看到。
appcfg.py download_app -A "canada-math" ./trunk3
我明白了：
stephen@stephen-AO725:~/webprog$ appcfg.py download_app -A "canada-math" ./trunk3
05:06 PM Host: appengine.google.com
05:06 PM Fetching file list...
Traceback (most recent call last):
File "/home/stephen/webprog/google_appengine/appcfg.py", line 171, in <module>
run_file(__file__, globals())
File "/home/stephen/webprog/google_appengine/appcfg.py", line 167, in run_file
execfile(script_path, globals_)
File "/home/stephen/webprog/google_appengine/google/appengine/tools/appcfg.py", line 4282, in <module>
main(sys.argv)
File "/home/stephen/webprog/google_appengine/google/appengine/tools/appcfg.py", line 4273, in main
result = AppCfgApp(argv).Run()
File "/home/stephen/webprog/google_appengine/google/appengine/tools/appcfg.py", line 2409, in Run
self.action(self)
File "/home/stephen/webprog/google_appengine/google/appengine/tools/appcfg.py", line 4003, in __call__
return method()
File "/home/stephen/webprog/google_appengine/google/appengine/tools/appcfg.py", line 2861, in DownloadApp
DoDownloadApp(rpcserver, out_dir, app_id, module, app_version)
File "/home/stephen/webprog/google_appengine/google/appengine/tools/appcfg.py", line 1373, in DoDownloadApp
result = rpcserver.Send('/api/files/list', **url_args)
File "/home/stephen/webprog/google_appengine/google/appengine/tools/appengine_rpc.py", line 393, in Send
f = self.opener.open(req)
File "/usr/lib/python2.7/urllib2.py", line 429, in open
response = self._open(req, data)
File "/usr/lib/python2.7/urllib2.py", line 447, in _open
'_open', req)
File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
result = func(*args)
File "/usr/lib/python2.7/urllib2.py", line 1241, in https_open
context=self._context)
TypeError: do_open() got an unexpected keyword argument 'context'
最简单的修复方法可能是通过在appcfg.py中运行Cloud Shell来下载源代码。这样可以确保您的appcfg.py和Python版本与App Engine API兼容。
取决于您的appcfg和Python的特定版本，您的版本可能不匹配。另外请记住appcfg is deprecated。另请参阅：