Possible groups:

Types constructors: bool, bytearray, bytes, complex, dict, float, frozenset, int, list, memoryview, object, range, set, slice, str, tuple

Mathematical functions: abs, bin, divmod, hex, oct, pow, round

Working with sequences: all, any, enumerate, filter, iter, len, map, max, min, reversed, sorted, sum, zip

Working with strings: chr, format, ord

I/O: input, open, print

Introspection/metaprogramming: ascii, delattr, dir, getattr, globals, hasattr, help, id, isinstance, issubclass, locals, repr, setattr, type, vars

Advanced functions: classmethod, compile, eval, exec, hash, next, property, staticmethod, super, __import__

The last two are debatable.