Whoa, you are amazing!
My initial recipes are here (in case it would be useful to take a look): https://bitbucket.org/dpat/scif_fsl/src/master/

So, I tried your branch by adding this to my Dockerfile instead of "RUN pip install scif":

RUN git clone -b test/stream-capture-output https://www.github.com/vsoch/scif
RUN cd scif && python setup.py install

It seemed to do the install, but then freaked out on my scif recipes (which were behaving last night). I'll upload the whole log, but things aren't interesting, I think, until about line 485.
scif_experiment_log.txt

You need to use Python 3.x version - at this point (since Python 2 end of life is ~2 months) you shouldn't be developing with Python 2, really ever.

I can try using from __future__ import print_function, but I'll still strongly suggest you not use Python 2 :)

Here is how it works:

Here is your error

$ python2
Python 2.7.15+ (default, Oct  7 2019, 17:39:04) 
[GCC 7.4.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> print("test", end="")
  File "<stdin>", line 1
    print("test", end="")
                     ^
SyntaxError: invalid syntax

Here is the workaround

>>> from __future__ import print_function
>>> print("test", end="\n")
test

Give me a few minutes to update the PR.

-> 19b6605

Gosh, this is news to me. I install Python3 in the Dockerfile...I guess, since it is based on Ubuntu Trusty, it must be using Python2 by default, even though I installed Python 3? Thanks for identifying that issue. I'll try to make improvements on my end.

Yes that's exactly true - the "python" executable maps to python 2, and python3 to python 3. Here is a quick example:

$ docker run -it ubuntu:trusty
# Not installed
root@25b7d9b5261e:/# which python
root@25b7d9b5261e:/# apt-get update && apt-get install -y python3 python3-dev
...
# still not installed
root@25b7d9b5261e:/# which python

# installed
root@25b7d9b5261e:/# which python3
/usr/bin/python3

I think when you install python-pip it probably installs python2 as a dependency. You want to do python3-pip instead, if I remember correctly.

I'm with you:
apt-get python3-pip
RUN pip3 install scif

Now I'll try with your streaming version.

Okay, your streaming version builds now...AND, it is streaming output right to my screen as it runs!!
So cool, thank you!

-Dianne

Awesome! I'm going to merge now (so you could install from master branch) but will wait to release on pypi as 0.0.78 until the conda recipe is merged conda-forge/staged-recipes#9853 that way the release will trigger a conda build.