无法使用"conda install python- graphviz“或"conda install graphviz”安装graphviz

Question

我尝试使用pip install graphviz安装graphviz包，并使用python3成功地将其导入到jupyter notebook中，但无法运行以下代码：

s = Source.from_file("tree_test.dot")
s.view()

tree_test.dot文件位于当前工作目录下。错误消息为：

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

有人建议我先使用pip uninstall graphviz卸载graphviz，然后分别尝试conda install graphviz和conda install python-graphviz。但这两个系统都无法安装graphviz，下面是错误消息：

Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: | 
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.
.....
#(spend long time examining conflict and shows what those conflicts are but still failed to install graphviz)#

Answer 1

根据Anaconda's package documentation，你需要输入：

conda install -c anaconda graphviz