Built-in types include int, float, complex, bool, str, list, tuple, range, dict, set, frozenset and NoneType.
1Key points
Immutable: int, float, str, tuple, frozenset, bool, None
Mutable: list, dict, set
{} is an empty dict; use set() for an empty set
round() uses banker's rounding (round half to even)
Floats are binary approximations: compare with a tolerance