[python] Macにpygraphvizをインストールする

March 13, 2019

Django-extentionsにはモデルをグラフィカルに表示できる機能があると耳にして、実際にやってみたら、pygraphvizをインストールする際につまづいたのでメモ。

環境

OS: Mac OS Mojave 10.14.3
python: pyenv python3.7.1

モデルをグラフィカルに表示する

メモの本題ではないので、軽く済ませますがDjango-extentionsにはモデルをグラフィカルに表示するコマンドがあり、以下のように実行します。

python manage.py graph_models -a -g -o graph-model.png

CommandError: Neither pygraphviz nor pydotplus could be found to generate the image. To generate text output, use the --json or --dot options.

実行してみたところpygraphvizとpydotplusというパッケージが足りないと言われたのでインストール

pygraphvizとpydotplusをインストール

pip install pygraphviz pydotplus

  Running setup.py install for pygraphviz ... error
    Complete output from command /Users/username/.pyenv/versions/3.7.1/bin/python3.7 -u -c "import setuptools, tokenize;__file__='/private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-record-fag39uff/install-record.txt --single-version-externally-managed --compile:
    running install
    Trying dpkg
    Failed to find dpkg
    Trying pkg-config
    Package libcgraph was not found in the pkg-config search path.
    Perhaps you should add the directory containing `libcgraph.pc'
    to the PKG_CONFIG_PATH environment variable
    No package 'libcgraph' found
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/setup.py", line 93, in <module>
        tests_require=['nose>=1.3.7', 'doctest-ignore-unicode>=0.1.2', 'mock>=2.0.0'],
      File "/Users/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/setuptools/__init__.py", line 129, in setup
        return distutils.core.setup(**attrs)
      File "/Users/username/.pyenv/versions/3.7.1/lib/python3.7/distutils/core.py", line 148, in setup
        dist.run_commands()
      File "/Users/username/.pyenv/versions/3.7.1/lib/python3.7/distutils/dist.py", line 966, in run_commands
        self.run_command(cmd)
      File "/Users/username/.pyenv/versions/3.7.1/lib/python3.7/distutils/dist.py", line 985, in run_command
        cmd_obj.run()
      File "/private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/setup_commands.py", line 44, in modified_run
        self.include_path, self.library_path = get_graphviz_dirs()
      File "/private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/setup_extra.py", line 162, in get_graphviz_dirs
        include_dirs, library_dirs = _try_configure(include_dirs, library_dirs, _pkg_config)
      File "/private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/setup_extra.py", line 117, in _try_configure
        i, l = try_function()
      File "/private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/setup_extra.py", line 72, in _pkg_config
        output = S.check_output(['pkg-config', '--libs-only-L', 'libcgraph'])
      File "/Users/username/.pyenv/versions/3.7.1/lib/python3.7/subprocess.py", line 389, in check_output
        **kwargs).stdout
      File "/Users/username/.pyenv/versions/3.7.1/lib/python3.7/subprocess.py", line 481, in run
        output=stdout, stderr=stderr)
    subprocess.CalledProcessError: Command '['pkg-config', '--libs-only-L', 'libcgraph']' returned non-zero exit status 1.
    
    ----------------------------------------
Command "/Users/username/.pyenv/versions/3.7.1/bin/python3.7 -u -c "import setuptools, tokenize;__file__='/private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-record-fag39uff/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/pq/s_dm6c0d183642pp933rkcqm0000gn/T/pip-install-8w4_fiaf/pygraphviz/

実行してみたところ上記のようなエラーに遭遇しました。
どうやら、依存するライブラリが無いらしいのでbrewでインストールします。

brew install graphviz

改めて実行。

pip install pygraphviz pydotplus

今度はきちんと入りました。

めでたしめでたし。

参考

http://hideharaaws.hatenablog.com/entry/2018/05/15/183533
https://qiita.com/ryoppippi/items/f484eb995ff1e913dd44