Cryptography woes: Can we freshen up our Python version...

[wexi]

Hi fellows,

cryptography is an essential module in my kivy / twisted / pyOpenSSL based app.
Building finally succeeded (it wasn't straightforward) but now we are run time testing.
Thanks to a tip from "tshirtman" I had a meaningful rpdb interactive session as follows:

$ telnet 192.168.1.254 4444
Trying 192.168.1.254...
Connected to 192.168.1.254.
Escape character is '^]'.
> /home/enoch/private/gsld/build/bdist.android-armeabi-v7a/gsld/main.py(38)<module>()
(Pdb) import cryptography
(Pdb) cryptography.__file__
'/data/data/info.gencon.gsld/files/app/lib/python2.7/site-packages/cryptography/__init__.pyo'
(Pdb) os.listdir('/data/data/info.gencon.gsld/files/app/lib/python2.7/site-packages/cryptography')
['utils.pyo', '__init__.pyo', '__about__.pyo', 'fernet.pyo', 'exceptions.pyo', 'x509', 'hazmat']
(Pdb) import cryptography.hazmat
(Pdb) import cryptography.x509
*** ImportError: cannot import name certificate_transparency
(Pdb) os.listdir('/data/data/info.gencon.gsld/files/app/lib/python2.7/site-packages/cryptography/x509')
['general_name.pyo', 'name.pyo', 'oid.pyo', '__init__.pyo', 'extensions.pyo', 'base.pyo', 'certificate_transparency.pyo']

This ImportError indicates that python was not able to get the module code! Not that a file is missing...
Since the same cryptography module (github master) works well in Linux I tend to believe that our stale Python version 2.7.2 is to blame... (Ubuntu is using 2.7.14). Or, do you have another idea?

Thanks, Enoch.

[inclement]

I don't know what's wrong here, is there a reason you think it must be the python version at fault? What is the full traceback (including details other than the plain ImportError statement)?

To answer the question though, I don't intend to update the python2 version any time soon. It would be quite complicated, and I'd rather work on improving the python3 support. If somebody does it, a PR would potentially be accepted.

[wexi]

I have cryptography now working in P4A.
See: pyca/cryptography#4046