如何确保 Graphviz 可执行文件在我系统的 PATH 上？

Question

I am working with Graphviz using Python 3 on Sublime Text 3. When I run this code:

data = tree.export_graphviz(dtGini[55], out_file = None)
graph = graphviz.Source(data)
graph.render("testingthis")

I get these errors:

FileNotFoundError: [WinError 2] The system cannot find the file specified

During handling of the above exception, another exception occurred:

graphviz.backend.ExecutableNotFound: failed to execute ['dot', '-Tpdf', '-O', 'testingthis'], make sure the Graphviz executables are on your systems' PATH

It looks like it can't find the files it needs. In Sublime Text 3, my user settings for Conda are:

{
// executable is the path to anaconda's python
// this python executable is used in order to find conda
"executable": "C:/ProgramData/Miniconda3/python.exe",

// Directory in which the conda envs are stored
// Default location is the user's home directory
"environment_directory": "C:/ProgramData/Miniconda3/envs",

// configuration is the path to conda's configuration file
"configuration": "~/.condarc"
}

I have these environment variables from my control panel:

C:\ProgramData\Miniconda3\Scripts\
C:\ProgramData\Miniconda3\
C:\ProgramData\Miniconda3\conda-meta\history
C:\Users\X\AppData\Local\conda\conda\pkgs
C:\Users\X\AppData\Local\conda\conda\pkgs\graphviz-2.38-hfd603c8_2\Library\bin
C:\Users\X\AppData\Local\conda\conda\pkgs\graphviz-2.38-hfd603c8_2\Library\bin\dot.exe

In the Anaconda prompt, when I enter Python, hit enter, and then type in "import graphviz" I get no error. In Sublime Text 3, if I just have a file like graph.py

import graphviz

It executes without any errors.

Any ideas on how I can solve this? It's driving me nuts. Thank you!

Answer 1

I followed a solution posted by @aprameyo roy here > "RuntimeError: Make sure the Graphviz executables are on your system's path" after installing Graphviz 2.38

The system path needed took some finding on my PC - I had used Ananconda to install the graphviz package.

Adding these two commands to my jupyter notebook solved the issue - change the C:/ address to your install location:

(PS. I think you will need to re-run this after every kernal restart.)

# extra step to allow graphviz to be found 
import os
os.environ["PATH"] += os.pathsep + 'C:/Users/jed/Anaconda3/envs/keras/Library/bin/graphviz/'

Answer 2

对我来说，解决方案是从他们的网站下载Graphviz（即使我已经从CMD下载了它），然后更改PATH变量以反映安装位置。

Answer 3

In case window i resolved this problem by following below steps:

step 1. install stable_windows_10_cmake_Release_Win32_graphviz-install-2.49.3-win32.exe

step2. add path in System variable "C:\\Program Files (x86)\\Graphviz\\bin"

2.1 On the Windows taskbar, right-click the Windows icon and select System.

2.2 In the Settings window, under Related Settings, click Advanced system settings.

2.3 On the Advanced tab, click Environment Variables.

step3. add below lines in my code

import os
import graphviz
os.environ["PATH"] += os.pathsep + 'C:/Program Files (x86)/Graphviz/bin/'
graph_data = "your  graph data"
fie_ext = 'png'
temp_img = 'temp_file'
temp_img_name = "".join([temp_img, '.'+fie_ext])
my_graph= graphviz.Source(graph_data)
my_graph.render(temp_img,format=fie_ext, view=False)