[lint] pylint searx/search/processors files / BTW add some doc-strings

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

searx/search/processors/__init__.py

@@ -1,37 +1,49 @@
 # SPDX-License-Identifier: AGPL-3.0-or-later
+# lint: pylint
+
+"""Implement request processores used by engine-types.
+
+"""
+
+__all__ = [
+    'EngineProcessor',
+    'OfflineProcessor',
+    'OnlineProcessor',
+    'OnlineDictionaryProcessor',
+    'OnlineCurrencyProcessor',
+    'processors',
+]
+
+from searx import logger
+import searx.engines as engines
 
 from .online import OnlineProcessor
 from .offline import OfflineProcessor
 from .online_dictionary import OnlineDictionaryProcessor
 from .online_currency import OnlineCurrencyProcessor
 from .abstract import EngineProcessor
-from searx import logger
-import searx.engines as engines
 
-
-__all__ = ['EngineProcessor', 'OfflineProcessor', 'OnlineProcessor',
-           'OnlineDictionaryProcessor', 'OnlineCurrencyProcessor', 'processors']
 logger = logger.getChild('search.processors')
 processors = {}
-
+"""Cache request processores, stored by *engine-name* (:py:func:`initialize`)"""
 
 def get_processor_class(engine_type):
+    """Return processor class according to the ``engine_type``"""
     for c in [OnlineProcessor, OfflineProcessor, OnlineDictionaryProcessor, OnlineCurrencyProcessor]:
         if c.engine_type == engine_type:
             return c
     return None
 
-
 def get_processor(engine, engine_name):
+    """Return processor instance that fits to ``engine.engine.type``)"""
     engine_type = getattr(engine, 'engine_type', 'online')
     processor_class = get_processor_class(engine_type)
     if processor_class:
         return processor_class(engine, engine_name)
-    else:
-        return None
-
+    return None
 
 def initialize(engine_list):
+    """Initialize all engines and store a processor for each engine in :py:obj:`processors`."""
     engines.initialize_engines(engine_list)
     for engine_name, engine in engines.engines.items():
         processor = get_processor(engine, engine_name)