I had this problem too, reinstalling (pip3 install -U) didn't help. But it went away after I manually removed site-packages/mypy/ and then reinstalled again.

Hm, I wonder if some metadata lingers around when you use pip uninstall and doesn't get overwritten when you reinstall?

Hm, I wonder if some metadata lingers around when you use pip uninstall and doesn't get overwritten when you reinstall?

It looks like this happened to me, typeshed was not overwritten, until I completely removed it manually.

Apparently explicitly installing typed-ast first solved the issue as well: python/the-knights-who-say-ni#93.

This seems to still be a problem, even with release of typed-ast-1.0.1, see this travis build for example.

Locally I've tried completely deleting my virtualenv directory and recreating but to no avail.

@samuelcolvin You're still using mypy 0.4.6. You gotta update your test/requirements.txt to use mypy==0.471 instead of mypy-lang=0.4.6. (Note the different spelling of both the package name and the version.)

Thanks, I also had to remove the typed-ast requirement to allow mypy to install the version of typed-ast it wants.

As per this mypy 4.7 requires typed-ast >= 0.6.3, < 0.7.0 and (for me at least) alwasy fails with 1 or 1.0.1

I believe this can be closed. If someone encounters an issue with a newer release, please open a new issue.