version.py: add module exporting __version__ from package metadata, as defined by setuptools_scm

This is better than hard-coding the string in the source files.

I don't put this in the top-level booleanOperations.__init__ because importing pkg_resources module is relatively expensive and would create an overhead upon importing booleanOperations.

Author: Cosimo Lupo

Lib/booleanOperations/__init__.py

@@ -1,8 +1,6 @@
 from __future__ import print_function, division, absolute_import
 from .booleanOperationManager import BooleanOperationManager
 
-__version__ = "0.5.1"
-
 # export BooleanOperationManager static methods
 union = BooleanOperationManager.union
 difference = BooleanOperationManager.difference

Lib/booleanOperations/version.py

@@ -0,0 +1,4 @@
+try:
+    __version__ = __import__('pkg_resources').require('booleanOperations')[0].version
+except Exception:
+    __version__ = 'unknown'