Incompatible with python 2.6

[mrname]

Incompatible with python 2.6

[stefanocrosta]

Ok, I see two things there:

• with python >= 2.7 numbers come out (nicely?) rounded, but with py 2.6 they come out as floats and thus fail equality comparison
• collections.Counter was introduced in python 2.7, so of course it's missing
  There's a backport of that: https://pypi.python.org/pypi/backport_collections/0.1

The second issue is thus easy to solve (I can add the backported package to the dependencies if the python version is <2.7).

The first issue seem related to the way that repr works in python 2.6 vs. 2.7

[https://docs.python.org/dev/whatsnew/2.7.html#python-3-1-features]: The repr() of a float x is shorter in many cases: it’s now based on the shortest decimal string that’s guaranteed to round back to x. As in previous versions of Python, it’s guaranteed that float(repr(x)) recovers x.

Simply try:

Python 2.6.9 (unknown, Sep  9 2014, 15:05:12)
[...]
>>> 2.6
2.6000000000000001

and

 Python 2.7.10 (default, Jul 13 2015, 12:05:58)
 [...]
 >>> 2.6
 2.6

(or see: http://stackoverflow.com/questions/20643386/floating-point-behavior-in-python-2-6-vs-2-7 )

To pass those tests, they should be written to print the same precision for py 2.6: '%.12g' % value

I'm not sure I care too much about that myself...
Though I understand that not everybody has the luxury to move to python 2.7