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我正在尝试在 OS X 上安装和使用 apptrace 以调试 GAE 内存......这很复杂，我仍然没有设法安装它。

文档说这是最简单的安装方法：

easy_install apptrace

但为了让它工作，我必须安装一堆依赖项，如 ActiveState、Guppy 以及可能更多......

后来经历了很多试验和错误，我想我已经走了很远，但仍然没有。所以我这样做是为了尝试重新安装 apptrace，然后安装它以捕获过程中的所有错误：

$ sudo pip uninstall apptrace
Uninstalling apptrace:
  /Library/Frameworks/Python.framework/Versions/2.7/bin/apptracectl
  /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/apptrace-0.2.3-py2.7.egg
Proceed (y/n)? y
  Successfully uninstalled apptrace

然后安装

$ sudo easy_install apptrace
Searching for apptrace
Reading https://pypi.python.org/simple/apptrace/
Reading http://code.google.com/p/apptrace
Best match: apptrace 0.2.3
Downloading https://pypi.python.org/packages/source/a/apptrace/apptrace-0.2.3.tar.gz#md5=ed03efe7afd70584a4bd461f429bdb75
Processing apptrace-0.2.3.tar.gz
Writing /tmp/easy_install-xi0K_4/apptrace-0.2.3/setup.cfg
Running apptrace-0.2.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-xi0K_4/apptrace-0.2.3/egg-dist-tmp-zhij3l
Adding apptrace 0.2.3 to easy-install.pth file
Installing apptracectl script to /Library/Frameworks/Python.framework/Versions/2.7/bin

Installed /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/apptrace-0.2.3-py2.7.egg
Processing dependencies for apptrace
Finished processing dependencies for apptrace

看起来没有发生任何错误对吧？

然后文档建议在应用程序根目录中创建一个 appengine_config.py 文件，其中包含：

  def webapp_add_wsgi_middleware(app):
    from apptrace.middleware import apptrace_middleware
    return apptrace_middleware(app)

完成后，下一个必需的步骤是：

apptracectl init <application root directory>

这会发生：

Traceback (most recent call last):
  File "/usr/local/bin/apptracectl", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2603, in <module>
    working_set.require(__requires__)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 666, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve
    raise DistributionNotFound(req)  # XXX put more info here
pkg_resources.DistributionNotFound: apptrace==0.2.3

所以这里的错误是pkg_resources.DistributionNotFound: apptrace==0.2.3 我该怎么办？

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