SyntaxError: future feature annotations is not defined in import kats

[orenpapers]

Hi,
I am using MAC and python3.6.
Installed Kats using pip and when trying:
import kats

I get the error:

Traceback (most recent call last):
  File "/venv/lib/python3.6/site-packages/IPython/core/interactiveshell.py", line 3343, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-4-f96c9197f95c>", line 1, in <module>
    import kats
  File "/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev/_pydev_bundle/pydev_import_hook.py", line 21, in do_import
    module = self._system_import(name, *args, **kwargs)
  File "venv/lib/python3.6/site-packages/kats/__init__.py", line 1, in <module>
    from . import consts   # noqa
  File "/Applications/PyCharm.app/Contents/plugins/python/helpers/pydev/_pydev_bundle/pydev_import_hook.py", line 21, in do_import
    module = self._system_import(name, *args, **kwargs)
  File "venv/lib/python3.6/site-packages/kats/consts.py", line 20
    from __future__ import annotations
                                     ^
SyntaxError: future feature annotations is not defined

Any idea?

[michaelbrundage]

Hi, it looks like this was added to Python 3.7 but not backported to 3.6: https://www.python.org/dev/peps/pep-0563/#enabling-the-future-behavior-in-python-3-7

So, either we should change the compatibility of Kats to clearly indicate 3.7+, or modify the code to use the string value of the type name (which I'm told has performance implications).

In the meantime, upgrading to Python 3.7 or 3.8 should unblock you.

[orenpapers]

@michaelbrundage Do you expect it to be python3.6 compatible?
Python3.7 will have some implication on other parts of the project so I want to know if it's better to wait

[michaelbrundage]

@orko19 we discussed with the team, and there are some other compatibility issues with 3.6. So, we will drop 3.6 support. So, 3.7 and 3.8, and we'll investigate 3.9 support ASAP.