string method calls before we explore formatting further as previewed in and to be covered in python and introduced new string type known as bytearraywhich is mutable and so may be changed in place bytearray objects aren' really text stringsthey're sequences of small -bit integers howeverthey support most of the same operations as normal strings and print as ascii characters when displayed accordinglythey provide another option for large amounts of simple -bit text that must be changed frequently (richer types of unicode text imply different techniquesin we'll also see that ord and chr handle unicode characterstoowhich might not be stored in single bytes string methods in addition to expression operatorsstrings provide set of methods that implement more sophisticated text-processing tasks in pythonexpressions and built-in functions may work across range of typesbut methods are generally specific to object types-string methodsfor examplework only on string objects the method sets of some types intersect in python ( many types have count and copy methods)but they are still more type-specific than other tools method call syntax as introduced in methods are simply functions that are associated with and act upon particular objects technicallythey are attributes attached to objects that happen to reference callable functions which always have an implied subject in finergrained detailfunctions are packages of codeand method calls combine two operations at once--an attribute fetch and callattribute fetches an expression of the form object attribute means "fetch the value of attribute in object call expressions an expression of the form function(argumentsmeans "invoke the code of func tionpassing zero or more comma-separated argument objects to itand return function' result value putting these two together allows us to call method of an object the method call expressionobject method(argumentsstring methods