The __version__ attribute's value SHOULD be a string.

http://legacy.python.org/dev/peps/pep-0396/#specification

patacrep/__init__.py

@@ -5,8 +5,8 @@ import os
 
 # Version
 
-__VERSION__ = (3, 7, 2)
+__TUPLE_VERSION__ = (3, 7, 2)
-__STR_VERSION__ = '.'.join([str(number) for number in __VERSION__])
+__version__ = '.'.join([str(number) for number in __TUPLE_VERSION__])
 
 # Directory containing shared data (default templates, custom LaTeX packages,
 # etc.)

setup.py

@@ -4,7 +4,7 @@
 
 $ python setup.py install
 """
-from patacrep import __STR_VERSION__
+from patacrep import __version__
 
 from setuptools import setup
 
@@ -14,7 +14,7 @@ import site
 
 
 SETUP = {"name": 'patacrep',
-        "version": __STR_VERSION__,
+        "version": __version__,
         "description": 'Songbook compilation chain',
         "author": 'The Songbook team',
         "author_email": 'crep@team-on-fire.com',

songbook

@@ -12,7 +12,7 @@ import textwrap
 import sys
 
 from patacrep.build import SongbookBuilder, DEFAULT_STEPS
-from patacrep import __STR_VERSION__
+from patacrep import __version__
 from patacrep import errors
 from patacrep import encoding
 
@@ -45,7 +45,7 @@ def argument_parser(args):
     parser = argparse.ArgumentParser(description="A song book compiler")
 
     parser.add_argument('--version', help='Show version', action='version',
-            version='%(prog)s ' + __STR_VERSION__)
+            version='%(prog)s ' + __version__)
 
     parser.add_argument('book', nargs=1, help=textwrap.dedent("""\
                     Book to compile.