false enter the following into the interactive shelland notice what each method call returnsspam 'helloworld!spam islower(false spam isupper(false 'helloisupper(true 'abc islower(true ' islower(false ' isupper(false since the upper(and lower(string methods themselves return stringsyou can call string methods on those returned string values as well expressions that do this will look like chain of method calls enter the following into the interactive shell'helloupper('hello'helloupper(lower('hello'helloupper(lower(upper('hello'hellolower('hello'hellolower(islower(true the isx(methods along with islower(and isupper()there are several other string methods that have names beginning with the word is these methods return boolean value that describes the nature of the string here are some common isx string methodsisalpha(returns true if the string consists only of letters and isn' blank returns true if the string consists only of letters and numbers and is not blank isdecimal(returns true if the string consists only of numeric characters and is not blank isspace(returns true if the string consists only of spacestabsand newlines and is not blank istitle(returns true if the string consists only of words that begin with an uppercase letter followed by only lowercase letters isalnum(