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

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

str.rsplit(sep=None, maxsplit=-1) Return a list of the words in the string, using sep as the delimiter string. If maxsplit

union(other, ...) set | other | ... Return a new set with elements from the set and all others.

str.isidentifier() Return true if the string is a valid identifier according to the language definition, section Identifiers

bytes.istitle() bytearray.istitle() Return true if the sequence is ASCII titlecase and the sequence is not empty

keys() Return a new view of the dictionary’s keys. See the documentation of view objects.

bytes.rsplit(sep=None, maxsplit=-1) bytearray.rsplit(sep=None, maxsplit=-1) Split the binary sequence into subsequences

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

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