安装 Graphviz 2.38 后“运行时错误：确保 Graphviz 可执行文件位于系统路径上”

Question

新手上路，请多包涵

我下载 Graphviz 2.38 MSI 版本并安装在文件夹 C:\Python34 下，然后我运行 pip install Graphviz ，一切顺利。在系统路径中，我添加了 C:\Python34\bin 。当我尝试运行测试脚本时，在 filename=dot.render(filename='test') 行中，我收到一条消息

 RuntimeError: failed to execute ['dot', '-Tpdf', '-O', 'test'], make sure the Graphviz executables are on your systems' path

我尝试将 "C:\Python34\bin\dot.exe" 放在系统路径中，但它没有工作，我什至创建了一个新的环境变量 "GRAPHVIZ_DOT" 值 "C:\Python34\bin\dot.exe" 仍然无法工作， .我尝试卸载 Graphviz 和 pip uninstall graphviz ，然后重新安装并再次 pip install ，但没有任何效果。

整个回溯消息是：

 Traceback (most recent call last):
  File "C:\Python34\lib\site-packages\graphviz\files.py", line 220, in render
    proc = subprocess.Popen(cmd, startupinfo=STARTUPINFO)
  File "C:\Python34\lib\subprocess.py", line 859, in __init__
    restore_signals, start_new_session)
  File "C:\Python34\lib\subprocess.py", line 1112, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:\Users\Documents\Kissmetrics\curves and lines\eventNodes.py", line 56, in <module>
    filename=dot.render(filename='test')
  File "C:\Python34\lib\site-packages\graphviz\files.py", line 225, in render
    'are on your systems\' path' % cmd)
RuntimeError: failed to execute ['dot', '-Tpdf', '-O', 'test'], make sure the Graphviz executables are on your systems' path

有没有人有这方面的经验？