Note that this is the public style guide (intended for contributions to Google open-source projects). The internal style guide has some differences, mainly to m

Note that this is the public style guide (intended for contributions to Google open-source projects). The internal style guide has some differences, mainly to more-closely match the styles of internal C++ and Java (things like naming and indenting). In my experience, any Python code in the core codebase follows the (internal) style guide. Big mostly-standalone projects like YouTube have their own style.