preface python primer python overview the python interpreter preview of python program objects in python identifiersobjectsand the assignment statement creating and using objects python' built-in classes expressionsoperatorsand precedence compound expressions and operator precedence control flow conditionals loops functions information passing python' built-in functions simple input and output console input and output files exception handling raising an exception catching an exception iterators and generators additional python conveniences conditional expressions comprehension syntax packing and unpacking of sequences scopes and namespaces modules and the import statement existing modules exercises xi