def list_and_add(a, b):
if not isinstance(b, list):<EOL><INDENT>b = [b]<EOL><DEDENT>if not isinstance(a, list):<EOL><INDENT>a = [a]<EOL><DEDENT>return a + b<EOL>
Coerce to lists and concatenate.

Args:
    a: A thing.
    b: A thing.

Returns:
    List. All the things.