Fix reading README & CHANGES RST files when the system encoding is not UTF-8

[mitchellrj]

By default open in text mode reads files in the system encoding, however in this case we know that the encoding of the files being read is UTF-8, regardless of the platform on which the package is being installed.

If this is run on a platform where the default encoding is not UTF-8, the setup.py call fails because CHANGES.rst cannot be read in ASCII mode (due to special characters in a contributor's name).

Collecting django-sortedm2m==0.9.4 (from -r /app/src/requirements.txt (line 36))
  Downloading django-sortedm2m-0.9.4.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 20, in <module>
      File "/tmp/pip-build-7vwuo22m/django-sortedm2m/setup.py", line 51, in <module>
        read('CHANGES.rst'),
      File "/tmp/pip-build-7vwuo22m/django-sortedm2m/setup.py", line 25, in read
        return open(os.path.join(os.path.dirname(__file__), *parts), 'r').read()
      File "/app/lib/python3.4/encodings/ascii.py", line 26, in decode
        return codecs.ascii_decode(input, self.errors)[0]
    UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in position 781: ordinal not in range(128)

    ----------------------------------------
     Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-7vwuo22m/django-sortedm2m

[gregmuellegger]

Awesome! Thanks for the contribution. That makes absolutely sense and you even removed one distinction between Python 2 and 3. Super cool :)

[gregmuellegger]

Does it make sense to create a new release for this? Or are installations via pip install ... not affected?

[mitchellrj]

Yes, it would require a new release. Source distribution eggs include and run the setup.py. The problem I encountered was when trying to install it via pip on an Ubuntu EC2 instance.

[gregmuellegger]

Cool, thanks. I just released 0.9.5: https://pypi.python.org/pypi/django-sortedm2m/

[mitchellrj]

Thanks for the rapid response!