flake8: fix PEP8 warnings about lambda

Fix the 'lambda to def' warnings

mopidy/audio/scan.py

@@ -25,7 +25,9 @@ class Scanner(object):
         sink = gst.element_factory_make('fakesink')
 
         audio_caps = gst.Caps(b'audio/x-raw-int; audio/x-raw-float')
-        pad_added = lambda src, pad: pad.link(sink.get_pad('sink'))
+
+        def pad_added(src, pad):
+            return pad.link(sink.get_pad('sink'))
 
         self._uribin = gst.element_factory_make('uridecodebin')
         self._uribin.set_property('caps', audio_caps)

mopidy/core/actor.py

@@ -113,7 +113,9 @@ class Backends(list):
         self.with_playlists = collections.OrderedDict()
 
         backends_by_scheme = {}
-        name = lambda b: b.actor_ref.actor_class.__name__
+
+        def name(b):
+            return b.actor_ref.actor_class.__name__
 
         for b in backends:
             has_library = b.has_library().get()

mopidy/local/search.py

@@ -21,37 +21,52 @@ def find_exact(tracks, query=None, uris=None):
             else:
                 q = value.strip()
 
-            uri_filter = lambda t: q == t.uri
-            track_name_filter = lambda t: q == t.name
-            album_filter = lambda t: q == getattr(
-                getattr(t, 'album', None), 'name', None)
-            artist_filter = lambda t: filter(
-                lambda a: q == a.name, t.artists)
-            albumartist_filter = lambda t: any([
-                q == a.name
-                for a in getattr(t.album, 'artists', [])])
-            composer_filter = lambda t: any([
-                q == a.name
-                for a in getattr(t, 'composers', [])])
-            performer_filter = lambda t: any([
-                q == a.name
-                for a in getattr(t, 'performers', [])])
-            track_no_filter = lambda t: q == t.track_no
-            genre_filter = lambda t: t.genre and q == t.genre
-            date_filter = lambda t: q == t.date
-            comment_filter = lambda t: q == t.comment
-            any_filter = lambda t: (
-                uri_filter(t) or
-                track_name_filter(t) or
-                album_filter(t) or
-                artist_filter(t) or
-                albumartist_filter(t) or
-                composer_filter(t) or
-                performer_filter(t) or
-                track_no_filter(t) or
-                genre_filter(t) or
-                date_filter(t) or
-                comment_filter(t))
+            def uri_filter(t):
+                return q == t.uri
+
+            def track_name_filter(t):
+                return q == t.name
+
+            def album_filter(t):
+                return q == getattr(getattr(t, 'album', None), 'name', None)
+
+            def artist_filter(t):
+                return filter(lambda a: q == a.name, t.artists)
+
+            def albumartist_filter(t):
+                return any([q == a.name for a in getattr(t.album,
+                           'artists', [])])
+
+            def composer_filter(t):
+                return any([q == a.name for a in getattr(t, 'composers', [])])
+
+            def performer_filter(t):
+                return any([q == a.name for a in getattr(t, 'performers', [])])
+
+            def track_no_filter(t):
+                return q == t.track_no
+
+            def genre_filter(t):
+                return (t.genre and q == t.genre)
+
+            def date_filter(t):
+                return q == t.date
+
+            def comment_filter(t):
+                return q == t.comment
+
+            def any_filter(t):
+                return (uri_filter(t) or
+                        track_name_filter(t) or
+                        album_filter(t) or
+                        artist_filter(t) or
+                        albumartist_filter(t) or
+                        composer_filter(t) or
+                        performer_filter(t) or
+                        track_no_filter(t) or
+                        genre_filter(t) or
+                        date_filter(t) or
+                        comment_filter(t))
 
             if field == 'uri':
                 tracks = filter(uri_filter, tracks)
@@ -102,38 +117,56 @@ def search(tracks, query=None, uris=None):
             else:
                 q = value.strip().lower()
 
-            uri_filter = lambda t: bool(t.uri and q in t.uri.lower())
-            track_name_filter = lambda t: bool(t.name and q in t.name.lower())
-            album_filter = lambda t: bool(
-                t.album and t.album.name and q in t.album.name.lower())
-            artist_filter = lambda t: bool(filter(
-                lambda a: bool(a.name and q in a.name.lower()), t.artists))
-            albumartist_filter = lambda t: any([
-                a.name and q in a.name.lower()
-                for a in getattr(t.album, 'artists', [])])
-            composer_filter = lambda t: any([
-                a.name and q in a.name.lower()
-                for a in getattr(t, 'composers', [])])
-            performer_filter = lambda t: any([
-                a.name and q in a.name.lower()
-                for a in getattr(t, 'performers', [])])
-            track_no_filter = lambda t: q == t.track_no
-            genre_filter = lambda t: bool(t.genre and q in t.genre.lower())
-            date_filter = lambda t: bool(t.date and t.date.startswith(q))
-            comment_filter = lambda t: bool(
-                t.comment and q in t.comment.lower())
-            any_filter = lambda t: (
-                uri_filter(t) or
-                track_name_filter(t) or
-                album_filter(t) or
-                artist_filter(t) or
-                albumartist_filter(t) or
-                composer_filter(t) or
-                performer_filter(t) or
-                track_no_filter(t) or
-                genre_filter(t) or
-                date_filter(t) or
-                comment_filter(t))
+            def uri_filter(t):
+                return bool(t.uri and q in t.uri.lower())
+
+            def track_name_filter(t):
+                return bool(t.name and q in t.name.lower())
+
+            def album_filter(t):
+                return bool(t.album and t.album.name
+                            and q in t.album.name.lower())
+
+            def artist_filter(t):
+                return bool(filter(lambda a:
+                            bool(a.name and q in a.name.lower()), t.artists))
+
+            def albumartist_filter(t):
+                return any([a.name and q in a.name.lower()
+                            for a in getattr(t.album, 'artists', [])])
+
+            def composer_filter(t):
+                return any([a.name and q in a.name.lower()
+                            for a in getattr(t, 'composers', [])])
+
+            def performer_filter(t):
+                return any([a.name and q in a.name.lower()
+                            for a in getattr(t, 'performers', [])])
+
+            def track_no_filter(t):
+                return q == t.track_no
+
+            def genre_filter(t):
+                return bool(t.genre and q in t.genre.lower())
+
+            def date_filter(t):
+                return bool(t.date and t.date.startswith(q))
+
+            def comment_filter(t):
+                return bool(t.comment and q in t.comment.lower())
+
+            def any_filter(t):
+                return (uri_filter(t) or
+                        track_name_filter(t) or
+                        album_filter(t) or
+                        artist_filter(t) or
+                        albumartist_filter(t) or
+                        composer_filter(t) or
+                        performer_filter(t) or
+                        track_no_filter(t) or
+                        genre_filter(t) or
+                        date_filter(t) or
+                        comment_filter(t))
 
             if field == 'uri':
                 tracks = filter(uri_filter, tracks)

mopidy/models.py

@@ -367,7 +367,9 @@ class Track(ImmutableObject):
     last_modified = None
 
     def __init__(self, *args, **kwargs):
-        get = lambda key: frozenset(kwargs.pop(key, None) or [])
+        def get(key):
+            return frozenset(kwargs.pop(key, None) or [])
+
         self.__dict__['artists'] = get('artists')
         self.__dict__['composers'] = get('composers')
         self.__dict__['performers'] = get('performers')

setup.cfg

@@ -3,8 +3,7 @@ application-import-names = mopidy,tests
 exclude = .git,.tox,build,js
 # Ignored flake8 warnings:
 # - E402 module level import not at top of file
-# - E731 do not assign a lambda expression, use a def
-ignore = E402,E731
+ignore = E402
 
 [wheel]
 universal = 1

tests/mpd/test_commands.py

@@ -64,7 +64,8 @@ class TestCommands(unittest.TestCase):
             pass
 
     def test_register_second_command_to_same_name_fails(self):
-        func = lambda context: True
+        def func(context):
+            pass
 
         self.commands.add('foo')(func)
         with self.assertRaises(Exception):
@@ -88,7 +89,10 @@ class TestCommands(unittest.TestCase):
 
     def test_function_has_required_and_optional_args_succeeds(self):
         sentinel = object()
-        func = lambda context, required, optional=None: sentinel
+
+        def func(context, required, optional=None):
+            return sentinel
+
         self.commands.add('bar')(func)
         self.assertEqual(sentinel, self.commands.call(['bar', 'arg']))
         self.assertEqual(sentinel, self.commands.call(['bar', 'arg', 'arg']))
@@ -111,12 +115,16 @@ class TestCommands(unittest.TestCase):
 
     def test_function_has_required_and_varargs_fails(self):
         with self.assertRaises(TypeError):
-            func = lambda context, required, *args: True
+            def func(context, required, *args):
+                pass
+
             self.commands.add('test')(func)
 
     def test_function_has_optional_and_varargs_fails(self):
         with self.assertRaises(TypeError):
-            func = lambda context, optional=None, *args: True
+            def func(context, optional=None, *args):
+                pass
+
             self.commands.add('test')(func)
 
     def test_function_hash_keywordargs_fails(self):
@@ -158,7 +166,9 @@ class TestCommands(unittest.TestCase):
         self.assertEqual('test', self.commands.call(['foo', 'test']))
 
     def test_call_passes_required_and_optional_argument(self):
-        func = lambda context, required, optional=None: (required, optional)
+        def func(context, required, optional=None):
+            return (required, optional)
+
         self.commands.add('foo')(func)
         self.assertEqual(('arg', None), self.commands.call(['foo', 'arg']))
         self.assertEqual(
@@ -182,20 +192,29 @@ class TestCommands(unittest.TestCase):
 
     def test_validator_gets_applied_to_required_arg(self):
         sentinel = object()
-        func = lambda context, required: required
+
+        def func(context, required):
+            return required
+
         self.commands.add('test', required=lambda v: sentinel)(func)
         self.assertEqual(sentinel, self.commands.call(['test', 'foo']))
 
     def test_validator_gets_applied_to_optional_arg(self):
         sentinel = object()
-        func = lambda context, optional=None: optional
+
+        def func(context, optional=None):
+            return optional
+
         self.commands.add('foo', optional=lambda v: sentinel)(func)
 
         self.assertEqual(sentinel, self.commands.call(['foo', '123']))
 
     def test_validator_skips_optional_default(self):
         sentinel = object()
-        func = lambda context, optional=sentinel: optional
+
+        def func(context, optional=sentinel):
+            return optional
+
         self.commands.add('foo', optional=lambda v: None)(func)
 
         self.assertEqual(sentinel, self.commands.call(['foo']))
@@ -203,28 +222,38 @@ class TestCommands(unittest.TestCase):
     def test_validator_applied_to_non_existent_arg_fails(self):
         self.commands.add('foo')(lambda context, arg: arg)
         with self.assertRaises(TypeError):
-            func = lambda context, wrong_arg: wrong_arg
+            def func(context, wrong_arg):
+                return wrong_arg
+
             self.commands.add('bar', arg=lambda v: v)(func)
 
     def test_validator_called_context_fails(self):
         return  # TODO: how to handle this
         with self.assertRaises(TypeError):
-            func = lambda context: True
+            def func(context):
+                pass
+
             self.commands.add('bar', context=lambda v: v)(func)
 
     def test_validator_value_error_is_converted(self):
         def validdate(value):
             raise ValueError
 
-        func = lambda context, arg: True
+        def func(context, arg):
+            pass
+
         self.commands.add('bar', arg=validdate)(func)
 
         with self.assertRaises(exceptions.MpdArgError):
             self.commands.call(['bar', 'test'])
 
     def test_auth_required_gets_stored(self):
-        func1 = lambda context: context
-        func2 = lambda context: context
+        def func1(context):
+            pass
+
+        def func2(context):
+            pass
+
         self.commands.add('foo')(func1)
         self.commands.add('bar', auth_required=False)(func2)
 
@@ -232,8 +261,12 @@ class TestCommands(unittest.TestCase):
         self.assertFalse(self.commands.handlers['bar'].auth_required)
 
     def test_list_command_gets_stored(self):
-        func1 = lambda context: context
-        func2 = lambda context: context
+        def func1(context):
+            pass
+
+        def func2(context):
+            pass
+
         self.commands.add('foo')(func1)
         self.commands.add('bar', list_command=False)(func2)