str.replace(old, new[, count]) Return a copy of the string with all occurrences of substring old replaced by new

str.islower() Return true if all cased characters [4] in the string are lowercase and there is at least one cased character

bytearray.isalnum() Return true if all bytes in the sequence are alphabetical ASCII characters or ASCII decimal digits and the

tobytes() Return the data in the buffer as a bytestring. This is equivalent to calling the

str.join(iterable) Return a string which is the concatenation of the strings in the iterable

issuperset(other) set >= other Test whether every element in other is in the set.

instance.__class__ The class to which a class instance belongs.

bytes.join(iterable) bytearray.join(iterable) Return a bytes or bytearray object which is the concatenation of the

bytearray.find(sub[, start[, end]]) Return the lowest index in the data where the subsequence sub is found, such that

setdefault(key[, default]) If key is in the dictionary, return its value. If not, insert key with a value