Python - setup.py - read version without importing (2/3 compatible)

get_version.py

"""
# This snippet is in public domain
# https://gist.github.com/techtonik/4066623/

# Minified (Python 2.6+, 3+ compatible):

import io
from os.path import dirname, join

def get_version(relpath):
  '''Read version info from a file without importing it'''
 
  for line in io.open(join(dirname(__file__), relpath), encoding='cp437'):
    if '__version__' in line:
      if '"' in line:
        # __version__ = "0.9"
        return line.split('"')[1]
      elif "'" in line:
        return line.split("'")[1]


# Minified (Python 2.5+, 3+ compatible):

from os.path import dirname, join

def get_version(relpath):
  '''Read version info from a file without importing it'''
 
  for line in open(join(dirname(__file__), relpath), 'rb'):
    # Decode to unicode for PY2/PY3 in a fail-safe way
    line = line.decode('cp437')
    if '__version__' in line:
      if '"' in line:
        # __version__ = "0.9"
        return line.split('"')[1]
      elif "'" in line:
        return line.split("'")[1]


# Usage

version=get_version('module.py')
print(version)

"""

# Full Python 2.5+, 3.x compatible version

def get_version(relpath):
  """Read version info from a file without importing it"""
  from os.path import dirname, join

  if '__file__' not in globals():
    # Allow to use function interactively
    root = '.'
  else:
    root = dirname(__file__)

  # The code below reads text file with unknown encoding in
  # in Python2/3 compatible way. Reading this text file
  # without specifying encoding will fail in Python 3 on some
  # systems (see http://goo.gl/5XmOH). Specifying encoding as
  # open() parameter is incompatible with Python 2
  
  # cp437 is the encoding without missing points, safe against:
  #   UnicodeDecodeError: 'charmap' codec can't decode byte...

  for line in open(join(root, relpath), 'rb'):
    line = line.decode('cp437')
    if '__version__' in line:
      if '"' in line:
        # __version__ = "0.9"
        return line.split('"')[1]
      elif "'" in line:
        return line.split("'")[1]