LambdaType vs FunctionType

Question

What's the difference? docs show nothing on this, and their help() is identical. Is there an object for which isinstance will fail with one but not other?

Answer 1

Back in 1994 I wasn't sure that we would always be using the same implementation type for lambda and def. That's all there is to it. It would be a pain to remove it, so we're just leaving it (it's only one line). If you want to add a note to the docs, feel free to submit a PR.

Answer 2

See cpython/Lib/types.py:

def _f(): pass
FunctionType = type(_f)
LambdaType = type(lambda: None)         # Same as FunctionType