Fix syntax error in raw_manager.py

metobscommon/util/raw_manager.py

@@ -15,11 +15,16 @@ from subprocess import check_call as sh
 LOG = logging.getLogger(__name__)
 
 core = re.compile('[^'+re.escape(os.sep)+']+')
-# where is directory b, relative to directory a? # Copied from rays cvs playgrd
+
+
 def relativedir(a, b):
+    """Where is directory b, relative to directory a?
+
+    Copied from rays cvs playgrd.
+    """
     a = os.path.abspath(a)
     b = os.path.abspath(b)
-    pfx = os.path.dirname(os.path.commonprefix( a,b]))+os.sep
+    pfx = os.path.dirname(os.path.commonprefix([a, b])) + os.sep
     a = a.replace(pfx, '', 1)
     b = b.replace(pfx, '', 1)
     a = re.sub(core, '..', a)