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Python Compatibility
For PINT, we recommend following the writing portable code practices as specified by the Astropy project.
A good start for Python 2/3 compatibility is adding the following line at the very top of each Python source:
#!python
from __future__ import (print_function, division, unicode_literals, absolute_import)
This will allow to write Python 2 code with part of the new syntax introduced by Python 3, making the code automatically compatible with the two versions.
While in Python 2 the division between two integers is always the integer part of the result (4/3 = 1), in Python 3 this has changed and now division correctly returns a float if required (4/3=1.33333...). Adding division to the __future__ imports makes division work this way also in Python 2. To execute an integer division, the operation is now a//b.
print is a function in Python 3. This means that while in Python 2 (without the print_function import from 'future') we wrote
#!python
print a
we now write
#!python
print(a)
print a, (a way not to print a newline at the end of the print) now becomes print(a, end='').
print >>fobj, a now becomes print(a, file=fobj)
TBD
TBD