python-qrcode: add Python3

[BKPepe]

Maintainer: @cotequeiroz
Compile tested: mvebu (cortex-a9_vfpv3) , Turris Omnia, OpenWrt master
Run tested: mvebu (cortex-a9_vfpv3) , Turris Omnia, OpenWrt SNAPSHOT, r9420-c17a68c

Description:

• update to version 6.1
• add Python3 variant together with source packages
• better looking URL
• resorted a little bit Makefile

[BKPepe]

Wow, I'm curious how this could even work, because there are missing dependencies.
Running OpenWrt SNAPSHOT, r9420-c17a68c on Turris Omnia.

According to README from pypi.org, which is same in repository of python-qrcode on Github.

You need pillow for a standard installation, which isn't packaged for Python3, yet. I will look at it and until I do it, this PR will remain as draft.

root@OpenWrt:~# python
Python 2.7.15 (default, Mar 02 2019, 09:09:01) 
[GCC 7.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import qrcode
>>> img = qrcode.make('Some data here')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/qrcode/main.py", line 11, in make
  File "/usr/lib/python2.7/site-packages/qrcode/main.py", line 289, in make_image
  File "/usr/lib/python2.7/site-packages/qrcode/image/pil.py", line 8, in <module>
ImportError: No module named Image

There are also a two issues. First one, again according to README you can use qr binary.

root@OpenWrt:~# qr "Some text" > test.png
Traceback (most recent call last):
  File "/usr/bin/qr", line 6, in <module>
    from pkg_resources import load_entry_point
ImportError: No module named pkg_resources

Once, I have installed python-setuptools, it works.

Installing python-setuptools (39.0.1-2) to root...
Downloading http://downloads.openwrt.org/snapshots/packages/arm_cortex-a9_vfpv3/packages/python-setuptools_39.0.1-2_arm_cortex-a9_vfpv3.ipk
Configuring python-setuptools.
root@OpenWrt:~# qr "Some text" > test.png
root@OpenWrt:~# 

The QR code (test.png) is created. :-)

The last one is caused by me as python-qrcode and python3-qrcode provides the same binary.

Collected errors:
 * check_data_file_clashes: Package python3-qrcode wants to install file /usr/bin/qr
	But that file is already provided by package  * python-qrcode
 * opkg_install_cmd: Cannot install package python3-qrcode.

[cotequeiroz]

I thought I had updated my Makefiles a while back, but I think this one was left behind. I was trying to update them all to python3, but this one had dependencies that were not met.

The reason I added this package was because it is a dependency to the seafile packages. I haven't tested it outside of that, so it may need some work.

If you want to take over as maintainer, please go ahead.

[cotequeiroz]

I've opened a #8446 with just the version bump, in case this takes a while.
If your only outstanding issue issue is the qr utility, you can (there are other ways):

• save one of them to /bin/qr, and the other in /usr/bin/qr (probably the easiest, although less elegant)
• build separate packages: qrcode-python-util, and qrcode-python3-util, and use PROVIDES, and CONFLICTS, like ucert and ucert-full are done in package/system/ucert/Makefile.

[BKPepe]

That was too fast and I didn't have any chance to left my comment in your pull request. If you'd ask, I could separate this pull request or edit it to just bump it the version. Because now, we did the same thing. I'm not stuck with qr binary as you would think and I want to do it as it should be.

I'm still dealing with setup.py in Pillow as it is a dependency for python-qrcode. The Python2 variant of pillow is passing as it should, but setup.py for Pillow is written so horrible that takes time for me and for now I cannot compile it as it is for Python3. I'm thinking of a few ways how to do it.

Yeah, it should be faster, but while at it, I'm learning new things and I like challenges. :-)

[cotequeiroz]

Sorry if I trumped you, it was not my intent. I just felt we should not leave the package in tree missing the dependencies, and while at it, I did the version bump as well.
Cheers

[BKPepe]

A few days ago, I had been finally able to compile Pillow for Python 3. Hopefully today or tomorrow, I will prepare the pull request and once it would be merged, this will be ready for review.

[neheb]

I assume this is ready?

[cotequeiroz]

Not yet. It needs python3-pillow first.