About Error SyntaxError: future feature annotations.... on python 3.6

[ctm6100]

about the Error

I am a Jetson user (using pyhton 3.6), for Adafruit_Python_PlatformDetect version bigger than 3.19.6
the following error wil be recived

>>> import board
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/board.py", line 39, in <module>
    import adafruit_platformdetect.constants.boards as ap_board
  File "/usr/local/lib/python3.6/dist-packages/adafruit_platformdetect/__init__.py", line 10, in <module>
    from .board import Board
  File "/usr/local/lib/python3.6/dist-packages/adafruit_platformdetect/board.py", line 24
    from __future__ import annotations
    ^
SyntaxError: future feature annotations is not defined

Issues

Maybe this due to the 3.20.0 added Type Annotations?
Therefore maybe the version that require Python 3.7 is starting from 3.20.0 instead of 3.21.0?

Possible quick fix for this issues

the solution that work for me (using python3.6)

1. remove the current version(anything > 3.19.6)
   $sudo -H pip3 uninstall Adafruit-PlatformDetect
2. specify the version to 3.19.6
   $sudo -H pip3 install Adafruit-PlatformDetect==3.19.6

OR
try backport of future annotations(not yet test)
OR
update to python3.7(painful in jetson)(not yet test)

[dhalbert]

Thanks, it sounds like maybe we should make a 3.20.1 release that requires 3.7, and withdraw the 3.20.0 release so it isn't found.

Is it possible in Jetson to install 3.7 or higher for user-only use, without replacing /usr/bin/python? Is there a package available or would you need to build it yourself?

[ctm6100]

yes it is possible. In fact, it is petty easy

sudo apt-get install -y python3.7
# update the python3 priority
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.7 2
# view the change
sudo update-alternatives --config python

However, the painful part is to re-config or re-install or build from source those package such as openCV, ROS, TensorRT, Pytorch, etc. on 3.7.

[makermelissa]

PR #230 may fix this.

[dhalbert]

If there are annotations in the imported CircuitPython code, then I think it the imports will fail, unfortunately, just further on.

Maybe the solution is on the Jetson to add this file in a PYTHONPATH-accessible place?
__future__.py:

annotations = False

This will not work if there are other uses of from __future__ import in other Python code that you are using.

[makermelissa]

I have updated the Jetson Nano Guide for installing Python 3.7 and making it the default, which actually was pretty easy:
https://learn.adafruit.com/circuitpython-libraries-on-linux-and-the-nvidia-jetson-nano/initial-setup#install-python-3-dot-7-and-make-default-3114929-19

[yulu54]

I have updated the Jetson Nano Guide for installing Python 3.7 and making it the default, which actually was pretty easy: https://learn.adafruit.com/circuitpython-libraries-on-linux-and-the-nvidia-jetson-nano/initial-setup#install-python-3-dot-7-and-make-default-3114929-19
So, Is that any problem at Opencv, numpy old version. Or are you update Opencv for python 3.7

[makermelissa]

Does Opencv not run on Python 3.7?

[yulu54]

Does

I'll try tomorrow 👍

[yulu54]

about the Error

I am a Jetson user (using pyhton 3.6), for Adafruit_Python_PlatformDetect version bigger than 3.19.6 the following error wil be recived

>>> import board
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/dist-packages/board.py", line 39, in <module>
    import adafruit_platformdetect.constants.boards as ap_board
  File "/usr/local/lib/python3.6/dist-packages/adafruit_platformdetect/__init__.py", line 10, in <module>
    from .board import Board
  File "/usr/local/lib/python3.6/dist-packages/adafruit_platformdetect/board.py", line 24
    from __future__ import annotations
    ^
SyntaxError: future feature annotations is not defined

Issues

Maybe this due to the 3.20.0 added Type Annotations? Therefore maybe the version that require Python 3.7 is starting from 3.20.0 instead of 3.21.0?

Possible quick fix for this issues

the solution that work for me (using python3.6)

1. remove the current version(anything > 3.19.6)
   $sudo -H pip3 uninstall Adafruit-PlatformDetect
2. specify the version to 3.19.6
   $sudo -H pip3 install Adafruit-PlatformDetect==3.19.6

OR try backport of future annotations(not yet test) OR update to python3.7(painful in jetson)(not yet test)

Thank you, downgrade is solve the problem

[makermelissa]

Thanks, it sounds like maybe we should make a 3.20.1 release that requires 3.7.

I'm not sure how that can be done at this point in time. Perhaps your git-fu is better than mine. I know we could remove both the 3.20.0 and 3.20.1 releases though, since they are the only 2 in the gap where it's broken.

[tekktrik]

What's the status of this? Blinka is now 3.7+, right?

[makermelissa]

What's the status of this? Blinka is now 3.7+, right?

Correct

[makermelissa]

Thank you, downgrade is solve the problem

Closing for now since the problem was solved.