Another possible typo in the metaflow book: on page 201, we have the following code snippet as attached in the screenshot. It looks to me like there is a backtick in ``NamespaceFlow'` , where it should be

'NamespaceFlow'

. I don't know if this is only on my version of the book though

ah, seems like a typographical bug indeed! Thanks for letting us know. I'll let Manning know too