Python 2/3 Compatible Version Checking without Third Party Packages

version_check_2_3.py

"""This gist describes how to check which version of Python is running.

This one is easy enough that there's really no reason to reach for six's
PY2/PY3 attributes.
"""

from sys import version_info

# verison_info acts like a named tuple of the form
# (major, minor, micro, releaselevel, serial), so standard tuple
# comparisons can be used:

PY2 = version_info < (3,) and >= (2,)  # running Python 2.x
PY3 = version_info >= (3,) and < (4,)  # Running Python3.x
PY34 = version_info >= (3, 4) and version_info < (3, 5)  # running 3.4.x

# You can also access tuple components by name:

PY2 = version_info.major == 2
PY3 = version_info.major == 3
PY34 = version_info.major == 3 and version_info.minor == 4

# Or by index, including slices:

PY2 = version_info[0] == 2
PY3 = version_info[1] == 3
PY34 = version_info[:2] == (3, 4)