(pylint) correct unused imports and vars

patacrep/content/__init__.py

@@ -241,7 +241,6 @@ def process_content(content, config=None):
     """
     contentlist = ContentList()
     plugins = config.get('_content_plugins', {})
-    keyword_re = re.compile(r'^ *(?P<keyword>[\w\*]*) *(\((?P<argument>.*)\))? *$')
     if not content:
         content = [{'song': None}]
     for elem in content:

patacrep/content/section.py

@@ -1,6 +1,6 @@
 """Allow LaTeX sections (starred or not) as content of a songbook."""
 
-from patacrep.content import ContentItem, ContentError, ContentList, EmptyContentList
+from patacrep.content import ContentItem, ContentList
 
 KEYWORDS = [
     "part",

patacrep/content/songsection.py

@@ -1,6 +1,6 @@
 """Allow 'songchapter' and 'songsection' as content of a songbook."""
 
-from patacrep.content import ContentItem, ContentError, ContentList, EmptyContentList
+from patacrep.content import ContentItem, ContentList
 
 KEYWORDS = [
     "songchapter",