polymorphism and set operations and version considerations expressions (see also lambda expressionsabout arbitrary call - code examples expression operators - functions versus generator - indexing numbers in - objects and operator overloading and quiz questions and answers slice statements and - string formatting - variables and extended sequence unpacking about - for loops and extending built-in types about by embedding by subclassing - extension modules factorials factory functions about - generic - gotchas metaclasses and false value in python booleans and - - built-in scope and operator overloading and - fieldstorage class fifo (first-in-first-out) __file__ attribute files (file object) (see also binary filestext filesabout close method closing common operations context manager context managers flush method generating namespaces __init__ py files - inspecting iteration in - list comprehensions and literals minimizing cross-file changes - module filenames __next__ method open built-in function and precedence over directories - print operations and quiz questions and answers read method readline method readlines method seek method storing objects in files - tools supporting type-specific methods usage considerations - write method writelines method xreadlines method filesystemsaccess-by-key (see access-by-key databases and filesystemsfilter built-in function generator expressions versus iteration and list comprehensions and - filtering test results first-class object model first-in-first-out (fifo) float built-in function floating-point numbers (float typeabout as_integer_ratio method is_integer method try statements and floatingpointerror exception floor division - for statement about extended sequence unpacking index