development languages used by many of Google’s open- source projects. As every C++ programmer knows, the language has many powerful features, but this power brings with it complexity, which in turn can make code code. These rules exist to keep the code base manageable while still allowing coders to use C++ language features produc- tively. Style, also known as readability, is what we call the conventions that guide. Note that this guide is not a C++ tutorial: we assume that the reader is familiar with the language. Goals of the Style Guide Why do we have this document? There are a few core goals that we believe

toggle all summaries with the big arrow button: ￿ Toggle all summaries Table of Contents Python Language Rules Lint Imports Packages Exceptions Global variables Nested/Local/Inner Classes and Functions Functions Conditional Expressions Default Argument Values Properties True/False evaluations Deprecated Language Features Lexical Scoping Function and Method Decorators Threading Power Features 1 Python Style Alternatively, there’s a “toggle all” at the top of this document. Background Python is the main scripting language used at Google. This style guide is a list of dos and don’ts for Python programs. To help you format

Sc. Shafaq Siddiqi, ISDS  Language  Lectures and slides: English  Communication and examination: English/German  Submitted paper and talk: English  Informal language (first name is fine), immediate Ontology-Driven System for Natural Language Querying over Relational Data Stores. PVLDB 9(12) 2016  #5.3 Fei Li, H. V. Jagadish: Constructing an Interactive Natural Language Interface for Relational Databases Blockchain. PVLDB 12(9) 2019  #6.2 Daniel Deutch, Nave Frost, Amir Gilad: Provenance for Natural Language Queries. PVLDB 10(5) 2017  #6.3 Adriane Chapman, H. V. Jagadish: Why not? SIGMOD 2009 Paper

Google’s R Style Guide Google’s R Style Guide R is a high-level programming language used primarily for statistical computing and graphics. The goal of the R Programming Style Guide is to make our R Calls 13. Function Documentation 14. Example Function 15. TODO Style: TODO(username) Summary: R Language Rules 1. attach: avoid using it 2. Functions: errors should be raised using stop() 3. Objects and be taken Language Attach The possibilities for creating errors when using attach are numerous. Avoid it. Functions Errors should be raised using stop(). Objects and Methods The S language has two

as the complete definition of Google’s coding standards for source code in the Java™ Programming Language. A Java source file is described as being in Google Style if and only if it adheres to the rules but never required (or encour- aged). 4.6.2 Horizontal whitespace Beyond where required by the language or other style rules, and apart from lit- erals, comments and Javadoc, a single ASCII space also Modifiers Class and member modifiers, when present, appear in the order recommended by the Java Language Specification: public protected private abstract default static final transient volatile synchronized

Recommendation  HW components: #nodes, CPUs, memory, network, I/O  SW components: OS, programming language, versions, other software  Baselines and configuration  Use recent versions of baseline systems