That's strange indeed - we have no issues installing dash in our CI test environments using Python 3.6, though for the most part this is a later version (currently 3.6.13 in this repo).

Locally (Mac) I have 3.6.8 and can install either dash 1.21.0 or 2.0.0 with various versions of pip. What OS and pip version are you using?

Hi Alex,

I'm running CentOS 7.8 with pip 21.0.1.

We have a small contained Kubernetes environment running Python 3.6.9 and I was able to successfully install dash 2.0.0 there from the same localized repository. I'm really at a loss and feel like it might have to do with the version of Python in anaconda maybe (3.6.4 as I mentioned), however like I said, I can't upgrade it "willy nilly" since there are many code dependencies that would have to be tested.

Any advice or suggestions would be greatly appreciated.

Thanks,

Greg

Good day,

I was able to determine my problem.

I had to download about 25 dependent packages for dash and based my download purely on the version that dash told me to download. One of the packages (importlib-metadata) was not compatible with Python 3.6.4. Once I downgraded this package it worked fine.

Thanks for your help and apologies for the user error.

Regards,

Greg

For the record, I really wish pip told me which package it was having a hard time with rather than simply the one that I'm trying to install.

@gfrair I'm happy to hear you've solved the issue! Perhaps we can resolve this for anyone else in this situation by adding a line to https://github.com/plotly/dash/blob/dev/requires-install.txt, something like:

importlib-metadata==x.y.z;python_version<"3.6.8"

ie what version x.y.z did you end up needing?

@alexcjohnson I ended up having to install version 4.8.3 of importlib_metadata. Might be useful to add, as it took me a couple days of immense frustration to solve, so I'm sure it would be appreciated if it helped other users avoid the same scenario, however I definitely should of thought of reviewing the dependencies sooner.... a bit of an ID10T error :)

Thanks again,

Greg

OK interesting - 4.8.3 is the last version compatible with Py3.6 at all, so I'm not sure why pip couldn't figure out to give you that. Anyway I'll add that to the requirements and hopefully that will save others your headache. Thanks!