python numbers number type conversion random number functions trigonometric functions mathematical constants python strings accessing values in strings updating strings escape characters string special operators string formatting operator triple quotes unicode string built-in string methods capitalize(method center(widthfillcharmethod count(strbeg ,end=len(string)method decode(encoding='utf- ',errors='strict'method encode(encoding='utf- ',errors='strict'method endswith(suffixbeg= end=len(string)method expandtabs(tabsize= find(strbeg= end=len(string) index(strbeg= end=len(string) isalnum(method isalpha(