Install¶
These instructions assume you have Python and a C/C++ Compiler on your computer.
Do not use the default channels to install pygraphviz with conda . The conda-forge channel should be used instead:
Recommended¶
We recommend installing Python packages using pip and virtual environments.
Linux¶
We recommend installing Graphviz using your Linux system’s package manager. Below are examples for some popular distributions.
Ubuntu and Debian¶
Fedora and Red Hat¶
You may need to replace dnf with yum in the example below.
macOS¶
We recommend installing Graphviz using the Homebrew package manager or MacPorts for macOS.
Homebrew¶
MacPorts¶
Advanced¶
installing Graphviz and
informing pip where Graphviz is installed.
Providing path to Graphviz¶
If you’ve installed Graphviz and pip is unable to find Graphviz, then you need to provide pip with the path(s) where it can find Graphviz. To do this, you first need to figure out where the binary files, includes files, and library files for Graphviz are located on your file system.
Once you know where you’ve installed Graphviz, you will need to do something like the following. There is an additional example using Chocolatey on Windows further down the page.
Windows¶
Historically, installing Graphviz and PyGraphviz on Windows has been challenging. Fortunately, the Graphviz developers are working to fix this and their recent releases have much improved the situation.
For this reason, PyGraphviz 1.7 only supports Graphviz 2.46.0 or higher on Windows. We recommend either manually installing the official binary release of Graphviz or using Chocolatey, which has been updated to Graphviz 2.46.0.
Assuming you have Python and Visual C/C++ installed, we believe the following should work on Windows 10 (64 bit) using PowerShell.
Manual download¶
Install PyGraphviz via
Chocolatey¶
Q
I followed the installation instructions but when I do:
I get an error like:
ImportError: libagraph.so.1: cannot open shared object file: No such file or directory
What is wrong?
A
Some Unix systems don’t include the Graphviz library in the default search path for the run-time linker. The path is often something like /usr/lib/graphviz or /sw/lib/graphviz etc. and it needs to be added to your search path. On *nix systems, the preferred way to do this is by setting the appropriate flags when building/installing pygraphviz . For example, if the Graphviz libraries are installed in /opt/lib/mygviz/ on your system:
In this example, the -L and -R flags tell the linker where to look for the required Graphviz libraries at build time and run time, respectively.
Q
How do I compile pygraphviz under Windows?
A
See Windows for the latest on how to install Graphviz and pygraphviz on Windows.
Q
Why don’t you distribute a pygraphviz Windows installer?
A
We would very much like to make binary wheels available for pygraphviz , but there are several complications. pygraphviz is a wrapper around Graphviz, which means that Graphviz must be installed, and Graphviz header files, libraries and command line executables must all be accessible for the wrapper. The recommended use of the Graphviz CLI poses challenges for wheel packaging.
See also
This GitHub issue for further discussion on wheels and packaging.
© Copyright 2004-2022, PyGraphviz Developers. Last updated on Aug 19, 2022.
User Guide¶
graphviz provides a simple pure-Python interface for the Graphviz graph-drawing software. It runs under Python 3.7+. To install it with pip, run the following:
For a system-wide install, this typically requires administrator access. For an isolated install, you can run the same inside a venv or a virtualenv.
After installing Graphviz, make sure that its bin/ subdirectory containing the dot layout command for rendering graph descriptions is on your systems’ PATH (sometimes done by the installer; setting PATH on Linux, Mac, and Windows): On the command-line, dot -V should print the version of your Graphiz installation.
Windows users might want to check the status of known issues (gvedit.exe, sfdp, commands) and consider trying an older archived version as a workaround (e.g. graphviz-2.38.msi).
See the downstream conda-forge distribution conda-forge/python-graphviz (feedstock), which should automatically conda install conda-forge/graphviz (feedstock) as dependency.
Basic usage¶
The graphviz package provides two main classes: graphviz.Graph and graphviz.Digraph . They create graph descriptions in the DOT language for undirected and directed graphs respectively. They have the same API .
Graph and Digraph produce different DOT syntax and have different values for directed .
Create a graph by instantiating a new Graph or Digraph object:
Their constructors allow to set the graph’s name identifier, the filename for the DOT source and the rendered graph, an optional comment for the first source code line, etc.
Add nodes and edges to the graph object using its node() and edge() or edges() methods:
The node() method takes a name identifier as first argument and an optional label . The edge() method takes the names of start node and end node, while edges() takes an iterable of name pairs. Keyword arguments are turned into (node and edge) attributes (see extensive Graphviz docs on available attributes).
Check the generated DOT source code:
Use the render() method to save the DOT source code and render it with the default dot layout engine (see below for using other layout engines).
Passing view=True will automatically open the resulting (PDF, SVG, PNG, etc.) file with your system’s default viewer application for the rendered file type.
Backslash-escapes and strings of the form <. > have a special meaning in the DOT language and are currently passed on as is by this library. If you need to render arbitrary strings literally (e.g. from user input), consider wrapping them with the graphviz.escape() function first. See the sections on Backslash escapes and Quoting and HTML-like labels below for details.
Formats¶
To use a different output file format than the default PDF, you canuse the format argument when creating your Graph or Digraph object:
You can also change the format attribute on an existing graph object:
Piped output¶
To directly access the raw results from the Graphviz dot layout command as binary bytes or as decoded str (for plain-text formats like SVG) instead of writing to a file, use the pipe() method of your Graph or Digraph object:
Because pipe() returns the raw stdout from the layout subprocess by default ( bytes ), you usually want to decode the return value when piping into formats like ‘svg’ or ‘plain’ ,
The output for pipe() is buffered in memory, so avoid this method if the data size is large.
Jupyter notebooks¶
Graph and Digraph objects have a _repr_mimebundle_() method so they can be rendered and displayed directly inside a Jupyter notebook. For an example, check the examples/graphviz-notebook.ipynb file in the source repository/distribution (or the same notebook in nbviewer).
This also allows direct displaying within the Jupyter Qt Console (also the one inside Spyder IDE):
By default _repr_mimebundle_() uses ‘svg’ format. You can use the graphviz.set_jupyter_format() to override the default format that is used for displaying in IPython/Jupyter. (example, nbviewer).
You can also use display_svg() , display_png() , or .display_jpeg() from IPython.display to display the rendered Graph or Digraph as SVG, PNG or JPEG in IPython/Jupyter.
Styling¶
Use the graph_attr , node_attr , and edge_attr arguments of the Graph and Digraph constuctors to change the default attributes for your graph, nodes, and edges.
After creation, the graph_attr , node_attr , and edge_attr attributes be edited on instances:
Attributes¶
To directly add DOT att_stmt attribute statements, call the attr() method of the Graph or Digraph instance with the wanted target as first argument and the attributes as keyword args.
Attribute statements affect all later graphs, nodes, or edges within the same (sub-)graph.
If you omit the first attr() argument, the method can be used to set arbitrary attributes as key-value pairs targeting the current (sub-)graph (e.g. for rankdir , label , or setting rank=’same’ within a subgraph context, example ):
Node ports & compass¶
The edge() and edges() methods use the colon-separated node[:port[:compass]] format for tail and head nodes. This allows to specify an optional node port plus an optional compass point the edge should aim at for the given tail or head node ( example ).
As colons are used to indicate port and compass for edges, node names containing one or more literal colons : are currently not supported. GH #54
There is no such restriction for the label argument, so you can work around by choosing a colon-free name together with the wanted label as demonstrated below
Backslash escapes¶
The Graphviz layout engines support a number of escape sequences such as \n , \l , \r (for placement of multi-line labels: centered, left-justified, right-justified) and \N , \G , \L (expanded to the current node name, graph name, object label). To be able to use them from this library (e.g. for labels), backslashes in strings are (mostly) passed on as is.
This means that literal backslashes need to be escaped (doubled) by the user. As the backslash is also special in Python string literals a second level of doubling is needed. E.g. label=’\\\\’ for a label that is rendered as single literal backlash: \ .
Doubling of backslashes can be avoided by using raw string literals ( r’. ‘ ) instead. This is similar to the solution proposed for the stdlib re module. See also https://en.wikipedia.org/wiki/Leaning_toothpick_syndrome.
To disable any special character meaning in a string (e.g. from user input to be rendered literally), use the graphviz.escape() function (similar to the re.escape() function):
To prevent breaking the internal quoting mechanism, the special meaning of \" as a backslash-escaped quote has been disabled since version 0.14 of this library. E.g. both label=’"’ and label=’\\"’ now produce the same DOT source [label="\""] (a label that renders as a literal quote). See also examples/graphviz-escapes.ipynb (nbviewer).
Quoting and HTML-like labels¶
The graph-building methods of Graph and Digraph objects automatically take care of quoting (and escaping quotes) where needed (whitespace, keywords, double quotes, etc.):
If a string starts with ‘<‘ and ends with ‘>’ , it is passed on as is, i.e. without quoting/escaping: The content between the angle brackets is treated by the Graphviz layout engine as special HTML string that can be used for HTML-like labels:
For strings that should literally begin with ‘<‘ and end with ‘>’ , use the graphviz.nohtml() function to disable the special meaning of angled parenthesis and apply normal quoting/escaping:
Before version 0.8.2 , the only workaround was to add leading or trailing space ( label=’ <>’ ):
Subgraphs & clusters¶
Graph and Digraph objects have a subgraph() method for adding a subgraph to the instance.
There are two ways to use it: Either with a ready-made instance of the same kind as the only argument (whose content is added as a subgraph) or omitting the graph argument (returning a context manager for defining the subgraph content more elegantly within a with -block).
First option, with graph as the only argument:
Second usage, with a with -block (omitting the graph argument):
Both produce the same result:
If the name of a subgraph begins with ‘cluster’ (all lowercase), the layout engine treats it as a special cluster subgraph ( example ). See the Subgraphs and Clusters section in DOT language.
When subgraph() is used as a context manager, the new graph instance is created with strict=None copying the parent graph values for directory , engine , format , renderer , formatter , and encoding :
These copied attributes are only relevant for rendering the subgraph independently (i.e. as a stand-alone graph) from within the with -block.
Engines¶
To use a different layout engine than the default dot when rendering your graph, you can use the engine argument on the constructor of Graph or Digraph .
You can also change the engine attribute on an existing instance:
neato no-op flag¶
The neato layout engine supports an additional rendering flag that allows more control over the node positioning and the edge layout via the pos, overlap, and splines attributes.
Use the neato_no_op keyword argument of render() or pipe() to pass it to the layout command:
Unflatten¶
To prepocess the DOT source of a Graph or Digraph with the unflatten preprocessor (manpage, PDF), use the unflatten() method.
unflatten() improves the aspect ratio of graphs with many leaves or disconnected nodes.
The method returns a Source object that you can render() , view() , etc. with the same basic API as Graph or Digraph objects (minus modification, see details below ).
Custom DOT statements¶
To add arbitrary statements to the created DOT source, you can use the body attribute of Graph and Digraph objects. It holds the verbatim list of ( str ) lines to be written to the source file (including their final newline). Use its append() or extend() method:
Note that you might need to correctly quote/escape identifiers and strings containing whitespace or other special characters when using this method.
Using raw DOT¶
To render a ready-made DOT source code string (instead of assembling one with the higher-level interface of Graph or Digraph ), create a graphviz.Source object holding your DOT string:
Use the render() method to save and render it:
Apart from lacking editing methods, Source objects have the same basic API as the higher-level Graph and Digraph objects (e.g. save() , render() , view() , pipe() methods, engine and format attributes, Jupyter notebook _repr_mimebundle_() , etc. See API docs ).
Existing files¶
To directly render an existing DOT source file (e.g. created with other tools), you can use the graphviz.render() function.
To directly display the rendered visualization of an existing DOT source file inside a Jupyter notebook or Qt Console, you can use graphviz.Source.from_file() (alternative constructor):
Note that render() and view() on Source instances returned by graphviz.Source.from_file() skip writing the loaded file back. The same holds for save() . The instances resolve default .save(skip_existing=None) to .save(skip_existing_run=True) to skip writing the read source back into the same file (specifically the same path that it was loaded from). Call .save(skip_existing=False) if you want to re-write the loaded source.
Before version 0.18 of this library, Source.save() , Source.render() , and Source.view() , wrote the content read into source back into the file. It was advised to use graphviz.render() and graphviz.view() to directly work on files if the superflous saving needed to be avoided.
Integration with viewers¶
On platforms such as Windows, viewer programs opened by render() with view=True (or eqivalently with the view() shortcut-method) might lock the (PDF, PNG, etc.) file for as long as the viewer is open (blocking re-rendering it with a Permission denied error).
Как установить graphviz в анаконда
Simple Python interface for Graphviz
- License: MIT
- Home: https://github.com/xflr6/graphviz
- Development: https://github.com/xflr6/graphviz
- Documentation: https://graphviz.readthedocs.io
- 1929861 total downloads
- Last upload: 7 months and 7 days ago
Installers
- linux-64 v0.8.4
- win-32 v0.8.2
- noarch v0.20.1
- win-64 v0.8.4
- osx-64 v0.8.4
conda install
Description
This package facilitates the creation and rendering of graph descriptions in the DOT language of the Graphviz graph drawing software from Python.
graphviz 0.20.1
This package facilitates the creation and rendering of graph descriptions in the DOT language of the Graphviz graph drawing software (upstream repo) from Python.
Create a graph object, assemble the graph by adding nodes and edges, and retrieve its DOT source code string. Save the source code to a file and render it with the Graphviz installation of your system.
Use the view option/method to directly inspect the resulting (PDF, PNG, SVG, etc.) file with its default application. Graphs can also be rendered and displayed within Jupyter notebooks (formerly known as IPython notebooks, example, nbviewer) as well as the Jupyter QtConsole.
Links
Installation
This package runs under Python 3.7+, use pip to install:
Make sure that the directory containing the dot executable is on your systems’ PATH (sometimes done by the installer; setting PATH on Linux, Mac, and Windows).