LambdaType is a synonym for FunctionType. There should be just one entry, as currently, but perhaps make that a bit clearer, as one could misread the current line as saying that FunctionType is the type of def statements and LambdaType is the type of lambda expressions. This misunderstanding appears in python-list discussions occasionally. So I think I would write

types.FunctionType(sig....)
types.LambdaType synonym for FunctionType

Create a function ....