pythonpath environment variable pythonstartup environment variable pythonunbuffered environment variable pythonverbose environment variable python vim utility pythonware site - pythonwarnings environment variable pythonwritebytecode environment variable pyunit - *qq command - option qa (quality assurance) qnx quantum mechanics queue type defined sequence types using - quit(command - * \ escape sequence raising exceptions see also exceptionshandling defined overview - passing error information to caller - range checking range of values in list raspberry pi rdbms (relational database management system) read(function readability of code reading files - readme files real-time data analysis recordsdatabase red hat red hat package manager (rpm) regular expressions relational database management system (rdbms) relational operators listing of - precedence using with if statements - relative paths remove(function repetition repetitive tasks see loops replace(function reporting problems required arguments - resources common mistakes - ides learnpython org tutorial online documentation performance third-party libraries - unicode characters web programming xml - resourcewarning exception returning data from functions - reusable code - reverse(function rfind(function rindex(function risc os rjust(function rmtree(function