Python 3 regressions in knossosdataset

[mdraw]

The last few commits require some changes to work on Python 3. From a quick glance:

• urllib2 and StringIO have to be replaced
• numpy string reading functions (fromstring, fromfile) need to be tested with real data. They probably won't work with byte strings.

[sdorkenw]

Right

• urllib2 --> urllib
• from StringIO import StringIO --> from io import StringIO
• numpy string reading function were tested with real data, but not under Py3. However, they were already used before the recent commits.

[mdraw]

Ah, I see, I was confused about the string reading part. The earlier problems with np.fromstring were due to joining bytes and strings (https://github.com/knossos-project/knossos_utils/commit/358339bb4881a8d0c7d1dafd411cee7338d248d4), but this doesn't apply here.

[sdorkenw]

Implemented:

• urllib2 --> requests
• StringIO.StringIO --> io.BytesIO