Graphviz is an open source graph visualization tool for drawing graphs and network structures. It provides a set of tools and libraries for creating and rendering graphics, allowing users to create complex charts and graphs from simple text descriptions.
Key features of Graphviz include:
- Text description: Users can use a text format similar to the DOT language to describe the graph structure, which defines attributes such as nodes, edges, colors, and shapes.
- Automatic layout: Graphviz provides a variety of automatic layout algorithms for determining the position of nodes to produce beautiful graph layouts.
- Multiple output formats: Users can output the generated graphics into different formats, including pictures (PNG, SVG, PDF, etc.) and text (PostScript, DOT, etc.).
- Extensibility: Graphviz supports a variety of plug-ins and libraries and can be integrated with other applications to facilitate customization of graph generation.
Graphviz is widely used in various fields such as data visualization, network topology diagrams, organization charts, flow charts, program structure diagrams, etc. It makes it relatively easy to create and share complex graphics, and is particularly useful for tasks that require automated graphics generation.
The complete error report is as follows:
graphviz.backend.ExecutableNotFound: failed to execute ['dot', '-Tpdf', '-O', 'Digraph.gv'], make sure the Graphviz executables are on your systems' PATH
Check relevant information, install Graphviz in the system, and add it to the system environment variables.
The official website download address of Graphviz is as follows (Graphviz is a graphics drawing tool software developed by AT&T Labs Research, not a python tool. Therefore, graphviz needs to be installed independently in the system, and only in the python environment through pip install graphviz Installing the corresponding component library cannot be used ---The pip install graphviz step is also necessary):
Graphviz official website download address:Download | Graphviz
After downloading and installing, add the bin path under the Graphviz folder to the system Path environment variable
After adding, click on the lower left corner of the computer to run and enter cmd to open the system environment command line. Enter dot -version to check whether the installation is successful.
If you successfully install Graphviz on your system and run the corresponding program, you still get the following error:
graphviz.backend.execute.ExecutableNotFound: failed to execute 'dot', make sure the Graphviz executables are on your systems' PATH
At this time, add the following code to the python code file to help the program find Graphviz in the system environment:
import os
os.environ["PATH"] += os.pathsep + 'C:/Program Files/Graphviz/bin'At this point the problem is solved and the program runs successfully:
