Google Java Style Guide http://www.hawstein.com/posts/google-java-style.html http://google.github.io/styleguide/javaguide.html Google C++ Style Guide http://zh-google-styleguide.readthedocs.io/en/latest/google-cpp-styleguide/contents/ http://google.github.io/styleguide/cppguide.html Google Python Style Guide http://zh-google-styleguide.readthedocs.io/en/latest/google-python-styleguide/contents/ http://google.github.io/styleguide/pyguide.html