Cant install tesseocr with pip -r

[xkrt]

Hi, I want to install tess with pip insatll -r requirements.txt (in running tests with tox actually), but this scenario doesnt work. See:

$ virtualenv test
$ cd test/
$ source bin/activate
(test) $ echo Cython >> requirements.txt
(test) $ echo tesserocr >> requirements.txt
(test) $ pip install -r requirements.txt

I got error:

Collecting Cython (from -r requirements.txt (line 1))
  Using cached Cython-0.25.2-cp35-cp35m-manylinux1_x86_64.whl
Collecting tesserocr (from -r requirements.txt (line 2))
  Using cached tesserocr-2.1.3.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-ag5vqu0y/tesserocr/setup.py", line 11, in <module>
        from Cython.Distutils import build_ext
    ImportError: No module named 'Cython'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-ag5vqu0y/tesserocr/

I'm Python newbie, but I think this issue maybe due to lack of setup_requires or install_requires in https://github.com/sirfz/tesserocr/blob/master/setup.py?

[sirfz]

pip install -r does not guarantee the order of modules installation. In your case, it's trying to install tesserocr before installing Cython. You can try one of the workarounds suggested here.

[xkrt]

@sirfz sorry, can you please read this issue pypa/pip#2478, especially this comment pypa/pip#2478 (comment) with answer
my issue not on the same topic?

[sirfz]

Yes, those are exactly what's happening in your case as far as I understand. You must install Cython before installing tesserocr.

Cython is a setup-requirement, not a runtime-requirement, so pip install tesserocr will not install Cython for you.

[xkrt]

As far I understand this comment pypa/pip#2478 (comment) tesserocr should setup_requires Cython with "some lazy-import glue", because it impossible run setup.py without Cython

[sirfz]

I've already implemented this in the tesseract4 branch. Not sure how well pip plays with setup_requires though.

You can try it out by switching to that branch and pip install . from the repo's root directory.

[xkrt]

Yes, this works for me:

$ virtualenv test
$ cd test/
$ source bin/activate
$ echo Cython >> requirements.txt
$ echo -egit+https://github.com/sirfz/tesserocr/@tesseract4#egg=tesseocr >> requirements.txt
$ pip install -r requirements.txt

Thanks!

[xkrt]

@sirfz is it possible backport your setup.py from tesseract4 branch to master? or publish current version of tesseract4 branch to pypi?