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Example of an init.sage file forcing one to use Python3-style print

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# -*- coding: utf-8 -*-
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### Encourage Python3 good habits even when using Python2-based Sage
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from __future__ import division, absolute_import, print_function
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from six import iteritems, iterkeys, itervalues
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from six.moves import range
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### Set colors depending on terminal background color
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# %colors NoColor   # to disable syntax coloring
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# %colors LightBG   # works well with light background
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%colors Linux     # works well with dark background
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### Custom banner, displays even when starting Sage in quiet mode with `sage -q`
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print("\n#    SageMath {}, released {}, based on Python {}.{}.{}.\n"
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.format(sage.version.version, sage.version.date, *sys.version_info[:3]) +
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"""
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sage: # Setup from init.sage: Python3-related imports, and a color choice
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sage: from __future__ import division, absolute_import, print_function
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sage: from six import iteritems, iterkeys, itervalues
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sage: from six.moves import range
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sage: %colors Linux     # works well with dark background
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""")
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### Hints from https://wiki.sagemath.org/Python3-compatible%20code
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# To check Python 3 syntax errors in every file changed in the current branch:
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#
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#     git diff --name-only develop your-new-branch | xargs -n 1 python3 -m py_compile
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#
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# To check Python 3 syntax errors in every Python file of Sage library --
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# see https://groups.google.com/d/topic/sage-devel/dwEABlLOWqI/discussion
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#
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#    find src/sage -name '*.py' | xargs -n 1 python3 -m py_compile
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