## Making python 2 and 3 compatible:

### Import above everything
from __future__ import print_function

### All print statements have to have brackets, like 
print("sint")

### Exceptions need to be in brackets as well
raise ValueError("dodgy value")

### Integer division
####python 2 currently rounds down, i.e. 2/3==0 not 0.66, while python 3 does true division
####rounding down in both python 2 and 3 is 2//3, thus with two slashes
####to run true division in python 2 and 3
from __future__ import division    # (at top of module)
#### and then use simply one slashassert 3 / 2 == 1.5
#### so far I have circumvented this problem by using a dot after integer (e.g. 2. instead of 2). So maybe try and fix this

### Imports relative to a package
####Suppose the package is:
mypackage/
    __init__.py
    submodule1.py
    submodule2.py
####and the code below is in submodule1.py:
#### Python 2 only:
import submodule2
#### Python 2 and 3:
from . import submodule2

### Change all ranges to list(range) as otherwise it will use the range from python3