safe way to access Python version

resources/scripts/display_version.py

@@ -2,10 +2,10 @@
 # (fr) Version
 
 from lazpaint import command, dialog
-import sys
+import platform
 
 lazpaint_version = command.get_version()
-python_version = sys.version_info
+python_version = platform.python_version()
 
-dialog.show_message("Python " + str(python_version[0]) + "." + str(python_version[1]) + "." + str(python_version[2]) + ", " + "LazPaint " + str(lazpaint_version[0]) + "." + str(lazpaint_version[1]) + "." + str(lazpaint_version[2]) )
+dialog.show_message("Python " + python_version + ", " + "LazPaint " + str(lazpaint_version[0]) + "." + str(lazpaint_version[1]) + "." + str(lazpaint_version[2]) )