graphviz安装仍报错 | 路径问题 | 已解决
问题：
【Python】安装Pygraphviz的正确姿势-CSDN博客
2 pygraphviz在windows10 64位下的安装问题（反斜杠的血案）
安装PyGraphviz的两个坑 – 数学思绪 (jhanmath.com)
python - Pip install pygraphviz 失败：pygraphviz 的构建轮失败 - SegmentFault 思否
报错：
FileNotFoundError Traceback (most recent call last)
D:\Anacondasetup\lib\site-packages\graphviz\backend\execute.py in run_check(cmd, input_lines, encoding, quiet, **kwargs)77 else:
---> 78 proc = subprocess.run(cmd, **kwargs)79 except OSError as e:D:\Anacondasetup\lib\subprocess.py in run(input, capture_output, timeout, check, *popenargs, **kwargs)492
--> 493 with Popen(*popenargs, **kwargs) as process:494 try:D:\Anacondasetup\lib\subprocess.py in __init__(self, args, bufsize, executable, stdin, stdout, stderr, preexec_fn, close_fds, shell, cwd, env, universal_newlines, startupinfo, creationflags, restore_signals, start_new_session, pass_fds, encoding, errors, text)857
--> 858 self._execute_child(args, executable, preexec_fn, close_fds,859 pass_fds, cwd, env,D:\Anacondasetup\lib\subprocess.py in _execute_child(self, args, executable, preexec_fn, close_fds, pass_fds, cwd, env, startupinfo, creationflags, shell, p2cread, p2cwrite, c2pread, c2pwrite, errread, errwrite, unused_restore_signals, unused_start_new_session)1310 try:
-> 1311 hp, ht, pid, tid = _winapi.CreateProcess(executable, args,1312 # no special securityFileNotFoundError: [WinError 2] 系统找不到指定的文件。The above exception was the direct cause of the following exception:ExecutableNotFound Traceback (most recent call last)
<ipython-input-1-d3a92eb95c6d> in <module>4 dot.node('B', 'Node B')5 dot.edge('A', 'B')
----> 6 dot.render('test-output', view=True)D:\Anacondasetup\lib\site-packages\graphviz\_tools.py in wrapper(*args, **kwargs)169 category=category)170
--> 171 return func(*args, **kwargs)172 173 return wrapperD:\Anacondasetup\lib\site-packages\graphviz\rendering.py in render(self, filename, directory, view, cleanup, format, renderer, formatter, neato_no_op, quiet, quiet_view, outfile, engine, raise_if_result_exists, overwrite_source)120 args.append(filepath)121
--> 122 rendered = self._render(*args, **kwargs)123 124 if cleanup:D:\Anacondasetup\lib\site-packages\graphviz\_tools.py in wrapper(*args, **kwargs)169 category=category)170
--> 171 return func(*args, **kwargs)172 173 return wrapperD:\Anacondasetup\lib\site-packages\graphviz\backend\rendering.py in render(engine, format, filepath, renderer, formatter, neato_no_op, quiet, outfile, raise_if_result_exists, overwrite_filepath)324 assert filepath is not None, 'work around pytype false alarm'325
--> 326 execute.run_check(cmd,327 cwd=filepath.parent if filepath.parent.parts else None,328 quiet=quiet,D:\Anacondasetup\lib\site-packages\graphviz\backend\execute.py in run_check(cmd, input_lines, encoding, quiet, **kwargs)79 except OSError as e:80 if e.errno == errno.ENOENT:
---> 81 raise ExecutableNotFound(cmd) from e82 raise83 ExecutableNotFound: failed to execute WindowsPath('dot'), make sure the Graphviz executables are on your systems' PATH解决：
从报错信息来看，问题在于系统无法找到 Graphviz 的可执行文件（dot）。这通常意味着 Graphviz 要么没有安装，要么没有正确地添加到系统的 PATH 环境变量中。
尝试pip install graphviz、pip install python-graphviz、pip install pygraphviz和去env里查看都已经安装了，但是运行命令的时候仍然会报错，无法绘制。所以应该是路径问题。 找了几个帖子，都是Anaconda下的Graphviz文件，bin添加到路径。但是在我的环境里找不到。于是下载Graphviz再setup后添加路径，解决√ 参考链接
让我们一步步解决这个问题：
- 确保 Graphviz 已安装：
- 如果您还没有安装 Graphviz，请从官方网站下载并安装（windows系统下载.msi文件）
- 将 Graphviz 添加到系统 PATH：
- 右击 "此电脑" 或 "我的电脑"，选择 "属性"
- 点击 "高级系统设置"
- 点击 "环境变量"
- 在 "系统变量" 中找到 "Path"，选中它并点击 "编辑"
- 点击 "新建"，添加 Graphviz 的 bin 目录路径（C:\Program Files (x86)\Graphviz2.38\bin）
- 点击 "确定" 保存所有更改
- 重启您的 Jupyter Notebook 或 IDE：
- 环境变量更改后，需要重启应用程序才能生效
- 验证安装：
- 打开命令提示符（CMD）
- 输入
dot -v，如果正确安装，应该会显示 Graphviz 的版本信息
然后就有我想绘制的决策树了
