I’m having issues getting python graphviz to find ‘dot’ in the PATH environment variable. This seems to be a well-documented problem, but I still can’t seem to get past it.

I have added graphviz to the PATH and restarted my IDE and computer afterwards. I can verify that I did this right because I can call ‘dot’ from the command line. However, graphviz still cannot find ‘dot’ for some reason. I have also uninstalled and reinstalled graphviz which didn’t work. I am using version 0.20.1.

Any ideas as to what is going wrong? Any help is much appreciated.

Here is an example code and full stack trace of the error:

import graphviz
g = graphviz.Digraph('G', filename='hello.gv')
g.edge('Hello', 'World')
g.view()

Traceback (most recent call last):
  File "C:Users.python_envlibrarysite-packagesgraphvizbackendexecute.py", line 81, in run_check
    proc = subprocess.run(cmd, **kwargs)
  File "C:Program FilesPython37libsubprocess.py", line 488, in run
    with Popen(*popenargs, **kwargs) as process:
  File "C:Program FilesPython37libsubprocess.py", line 800, in __init__
    restore_signals, start_new_session)
  File "C:Program FilesPython37libsubprocess.py", line 1207, in _execute_child
    startupinfo)
FileNotFoundError: [WinError 2] The system cannot find the file specified

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "C:Users graphviz_test.py", line 7, in <module>
    g.view()
  File "C:Users.python_envlibrarysite-packagesgraphviz_tools.py", line 171, in wrapper
    return func(*args, **kwargs)
  File "C:Users.python_envlibrarysite-packagesgraphvizrendering.py", line 186, in view
    cleanup=cleanup, quiet=quiet, quiet_view=quiet_view)
  File "C:Users.python_envlibrarysite-packagesgraphviz_tools.py", line 171, in wrapper
    return func(*args, **kwargs)
  File "C:Users.python_envlibrarysite-packagesgraphvizrendering.py", line 122, in render
    rendered = self._render(*args, **kwargs)
  File "C:Users.python_envlibrarysite-packagesgraphviz_tools.py", line 171, in wrapper
    return func(*args, **kwargs)
  File "C:Users.python_envlibrarysite-packagesgraphvizbackendrendering.py", line 327, in render
    capture_output=True)
  File "C:Users.python_envlibrarysite-packagesgraphvizbackendexecute.py", line 84, in run_check
    raise ExecutableNotFound(cmd) from e
graphviz.backend.execute.ExecutableNotFound: failed to execute 'dot', make sure the Graphviz executables are on your systems' PATH