linting: pylint 2.0.0

32 files changed, 112 insertions, 126 deletions

diff --git a/ranger/api/commands.py b/ranger/api/commands.py
index 097ead2c..35e073cc 100644
--- a/ranger/api/commands.py
+++ b/ranger/api/commands.py
@@ -70,7 +70,7 @@ class CommandContainer(object):
             lst = [cls for cmd, cls in self.commands.items()
                    if cls.allow_abbrev and cmd.startswith(name)
                    or cmd == name]
-            if len(lst) == 0:
+            if not lst:
                 raise KeyError
             if len(lst) == 1:
                 return lst[0]
@@ -112,8 +112,7 @@ class Command(FileManagerAware):
         classdict = cls.__mro__[0].__dict__
         if 'name' in classdict and classdict['name']:
             return cls.name
-        else:
-            return cls.__name__
+        return cls.__name__
 
     def execute(self):
         """Override this"""
@@ -230,7 +229,7 @@ class Command(FileManagerAware):
         flags = ""
         args = self.line.split()
         rest = ""
-        if len(args) > 0:
+        if args:
             rest = self.line[len(args[0]):].lstrip()
             for arg in args[1:]:
                 if arg == "--":
@@ -283,7 +282,7 @@ class Command(FileManagerAware):
             dirnames.sort()
 
             # no results, return None
-            if len(dirnames) == 0:
+            if not dirnames:
                 return
 
             # one result. since it must be a directory, append a slash.
@@ -347,7 +346,7 @@ class Command(FileManagerAware):
             pass
         else:
             # no results, return None
-            if len(names) == 0:
+            if not names:
                 return
 
             # one result. append a slash if it's a directory
@@ -399,7 +398,7 @@ class FunctionCommand(Command):
                     value = (value == 'True')
                 else:
                     try:
-                        value = float(value)  # pylint: disable=redefined-variable-type
+                        value = float(value)
                     except Exception:
                         pass
 
diff --git a/ranger/colorschemes/default.py b/ranger/colorschemes/default.py
index 9ccb6ff2..7f4c48c5 100644
--- a/ranger/colorschemes/default.py
+++ b/ranger/colorschemes/default.py
@@ -52,7 +52,7 @@ class Default(ColorScheme):
                 if context.device:
                     attr |= bold
             if context.link:
-                fg = context.good and cyan or magenta
+                fg = cyan if context.good else magenta
             if context.tag_marker and not context.selected:
                 attr |= bold
                 if fg in (red, magenta):
@@ -80,7 +80,7 @@ class Default(ColorScheme):
         elif context.in_titlebar:
             attr |= bold
             if context.hostname:
-                fg = context.bad and red or green
+                fg = red if context.bad else green
             elif context.directory:
                 fg = blue
             elif context.tab:
diff --git a/ranger/colorschemes/solarized.py b/ranger/colorschemes/solarized.py
index 0cfcb86d..ad57dd8a 100644
--- a/ranger/colorschemes/solarized.py
+++ b/ranger/colorschemes/solarized.py
@@ -62,7 +62,7 @@ class Solarized(ColorScheme):
                 bg = 230
                 attr |= bold
             if context.link:
-                fg = context.good and 37 or 160
+                fg = 37 if context.good else 160
                 attr |= bold
                 if context.bad:
                     bg = 235
@@ -93,13 +93,13 @@ class Solarized(ColorScheme):
         elif context.in_titlebar:
             attr |= bold
             if context.hostname:
-                fg = context.bad and 16 or 255
+                fg = 16 if context.bad else 255
                 if context.bad:
                     bg = 166
             elif context.directory:
                 fg = 33
             elif context.tab:
-                fg = context.good and 47 or 33
+                fg = 47 if context.good else 33
                 bg = 239
             elif context.link:
                 fg = cyan
diff --git a/ranger/config/commands.py b/ranger/config/commands.py
index 5fed15ac..1e7ac78c 100755
--- a/ranger/config/commands.py
+++ b/ranger/config/commands.py
@@ -182,7 +182,7 @@ class cd(Command):
                 dirnames = bookmarks + dirnames
 
             # no results, return None
-            if len(dirnames) == 0:
+            if not dirnames:
                 return
 
             # one result. since it must be a directory, append a slash.
@@ -236,13 +236,12 @@ class shell(Command):
             selection = self.fm.thistab.get_selection()
             if len(selection) == 1:
                 return self.line + selection[0].shell_escaped_basename + ' '
-            else:
-                return self.line + '%s '
-        else:
-            before_word, start_of_word = self.line.rsplit(' ', 1)
-            return (before_word + ' ' + file.shell_escaped_basename
-                    for file in self.fm.thisdir.files or []
-                    if file.shell_escaped_basename.startswith(start_of_word))
+            return self.line + '%s '
+
+        before_word, start_of_word = self.line.rsplit(' ', 1)
+        return (before_word + ' ' + file.shell_escaped_basename
+                for file in self.fm.thisdir.files or []
+                if file.shell_escaped_basename.startswith(start_of_word))
 
 
 class open_with(Command):
@@ -273,10 +272,7 @@ class open_with(Command):
         mode = 0
         split = string.split()
 
-        if len(split) == 0:
-            pass
-
-        elif len(split) == 1:
+        if len(split) == 1:
             part = split[0]
             if self._is_app(part):
                 app = part
@@ -964,8 +960,7 @@ class relink(Command):
     def tab(self, tabnum):
         if not self.rest(1):
             return self.line + os.readlink(self.fm.thisfile.path)
-        else:
-            return self._tab_directory_content()
+        return self._tab_directory_content()
 
 
 class help_(Command):
@@ -1261,10 +1256,12 @@ class scout(Command):
             regex = "^(?:(?!%s).)*$" % regex
 
         # Compile Regular Expression
+        # pylint: disable=no-member
         options = re.UNICODE
         if self.IGNORE_CASE in flags or self.SMART_CASE in flags and \
                 pattern.islower():
             options |= re.IGNORECASE
+        # pylint: enable=no-member
         try:
             self._regex = re.compile(regex, options)
         except Exception:
@@ -1467,9 +1464,8 @@ class meta(prompt_metadata):
         metadata = self.fm.metadata.get_metadata(self.fm.thisfile.path)
         if key in metadata and metadata[key]:
             return [" ".join([self.arg(0), self.arg(1), metadata[key]])]
-        else:
-            return [self.arg(0) + " " + k for k in sorted(metadata)
-                    if k.startswith(self.arg(1))]
+        return [self.arg(0) + " " + k for k in sorted(metadata)
+                if k.startswith(self.arg(1))]
 
 
 class linemode(default_linemode):
diff --git a/ranger/container/directory.py b/ranger/container/directory.py
index 44ca45fe..1fa9065f 100644
--- a/ranger/container/directory.py
+++ b/ranger/container/directory.py
@@ -217,12 +217,13 @@ class Directory(  # pylint: disable=too-many-instance-attributes,too-many-public
         self._gc_marked_items()
         if not self.files:
             return []
+
         if self.marked_items:
             return [item for item in self.files if item.marked]
         elif self.pointed_obj:
             return [self.pointed_obj]
-        else:
-            return []
+
+        return []
 
     def refilter(self):
         if self.files_all is None:
@@ -360,10 +361,8 @@ class Directory(  # pylint: disable=too-many-instance-attributes,too-many-public
                                         is_directory=True,
                                     )
                     else:
-                        item = File(  # pylint: disable=redefined-variable-type
-                            name, preload=stats, path_is_abs=True,
-                            basename_is_rel_to=basename_is_rel_to
-                        )
+                        item = File(name, preload=stats, path_is_abs=True,
+                                    basename_is_rel_to=basename_is_rel_to)
                         item.load()
                         disk_usage += item.size
                         if self.vcs and self.vcs.track:
diff --git a/ranger/container/file.py b/ranger/container/file.py
index a746345c..2312761f 100644
--- a/ranger/container/file.py
+++ b/ranger/container/file.py
@@ -27,7 +27,7 @@ PREVIEW_BLACKLIST = re.compile(r"""
         # ignore fully numerical file extensions:
             (\.\d+)*?
         $
-""", re.VERBOSE | re.IGNORECASE)
+""", re.VERBOSE | re.IGNORECASE)  # pylint: disable=no-member
 
 # Preview these files (almost) always:
 PREVIEW_WHITELIST = re.compile(r"""
@@ -37,7 +37,7 @@ PREVIEW_WHITELIST = re.compile(r"""
         # ignore filetype-independent suffixes:
             (\.part|\.bak|~)?
         $
-""", re.VERBOSE | re.IGNORECASE)
+""", re.VERBOSE | re.IGNORECASE)  # pylint: disable=no-member
 
 
 class File(FileSystemObject):
diff --git a/ranger/container/history.py b/ranger/container/history.py
index 857f12b6..5a75854e 100644
--- a/ranger/container/history.py
+++ b/ranger/container/history.py
@@ -72,7 +72,7 @@ class History(object):
         """
         assert isinstance(other_history, History)
 
-        if len(self._history) == 0:
+        if not self._history:
             self._index = 0
             future_length = 0
         else:
@@ -81,7 +81,9 @@ class History(object):
         self._history[:self._index] = list(
             other_history._history[:other_history._index + 1])  # pylint: disable=protected-access
         if len(self._history) > self.maxlen:
-            self._history = self._history[-self.maxlen:]  # pylint: disable=protected-access
+            # pylint: disable=protected-access,invalid-unary-operand-type
+            self._history = self._history[-self.maxlen:]
+            # pylint: enable=protected-access,invalid-unary-operand-type
 
         self._index = len(self._history) - future_length - 1
         assert self._index < len(self._history)
@@ -123,7 +125,7 @@ class History(object):
 
     def search(self, string, n):
         if n != 0 and string:
-            step = n > 0 and 1 or -1
+            step = 1 if n > 0 else -1
             i = self._index
             steps_left = steps_left_at_start = int(abs(n))
             while steps_left:
diff --git a/ranger/container/settings.py b/ranger/container/settings.py
index 9bbc777a..acbf9d16 100644
--- a/ranger/container/settings.py
+++ b/ranger/container/settings.py
@@ -174,20 +174,20 @@ class Settings(SignalDispatcher, FileManagerAware):
                 if name in self._localsettings[pattern] and\
                         regex.search(localpath):
                     return self._localsettings[pattern][name]
+
         if self._tagsettings and path:
             realpath = os.path.realpath(path)
             if realpath in self.fm.tags:
                 tag = self.fm.tags.marker(realpath)
                 if tag in self._tagsettings and name in self._tagsettings[tag]:
                     return self._tagsettings[tag][name]
-        if name in self._settings:
-            return self._settings[name]
-        else:
+
+        if name not in self._settings:
             type_ = self.types_of(name)[0]
             value = DEFAULT_VALUES[type_]
             self._raw_set(name, value)
             self.__setattr__(name, value)
-            return self._settings[name]
+        return self._settings[name]
 
     def __setattr__(self, name, value):
         if name.startswith('_'):
@@ -198,8 +198,7 @@ class Settings(SignalDispatcher, FileManagerAware):
     def __getattr__(self, name):
         if name.startswith('_'):
             return self.__dict__[name]
-        else:
-            return self.get(name, None)
+        return self.get(name, None)
 
     def __iter__(self):
         for setting in self._settings:
@@ -214,8 +213,7 @@ class Settings(SignalDispatcher, FileManagerAware):
         else:
             if isinstance(typ, tuple):
                 return typ
-            else:
-                return (typ, )
+            return (typ,)
 
     def _check_type(self, name, value):
         typ = ALLOWED_SETTINGS[name]
@@ -278,8 +276,7 @@ class LocalSettings(object):  # pylint: disable=too-few-public-methods
     def __getattr__(self, name):
         if name.startswith('_'):
             return self.__dict__[name]
-        else:
-            return self._parent.get(name, self._path)
+        return self._parent.get(name, self._path)
 
     def __iter__(self):
         for setting in self._parent._settings:  # pylint: disable=protected-access
diff --git a/ranger/container/tags.py b/ranger/container/tags.py
index 2e5623f3..dd13c432 100644
--- a/ranger/container/tags.py
+++ b/ranger/container/tags.py
@@ -68,8 +68,7 @@ class Tags(object):
     def marker(self, item):
         if item in self.tags:
             return self.tags[item]
-        else:
-            return self.default_tag
+        return self.default_tag
 
     def sync(self):
         try:
@@ -133,7 +132,7 @@ class TagsDummy(Tags):
     def add(self, *items, **others):
         pass
 
-    def remove(self, *items, **others):
+    def remove(self, *items):
         pass
 
     def toggle(self, *items, **others):
diff --git a/ranger/core/actions.py b/ranger/core/actions.py
index cd48fc40..1a6b5331 100644
--- a/ranger/core/actions.py
+++ b/ranger/core/actions.py
@@ -614,7 +614,7 @@ class Actions(  # pylint: disable=too-many-instance-attributes,too-many-public-m
         elif string in ALLOWED_VALUES:
             current = self.settings[string]
             allowed = ALLOWED_VALUES[string]
-            if len(allowed) > 0:
+            if allowed:
                 if current not in allowed and current == "":
                     current = allowed[0]
                 if current in allowed:
@@ -705,7 +705,7 @@ class Actions(  # pylint: disable=too-many-instance-attributes,too-many-public-m
     def search_file(self, text, offset=1, regexp=True):
         if isinstance(text, str) and regexp:
             try:
-                text = re.compile(text, re.U | re.I)
+                text = re.compile(text, re.UNICODE | re.IGNORECASE)  # pylint: disable=no-member
             except Exception:
                 return False
         self.thistab.last_search = text
@@ -927,10 +927,9 @@ class Actions(  # pylint: disable=too-many-instance-attributes,too-many-public-m
         if version_info[0] < 3:
             return os.path.join(ranger.args.cachedir,
                                 sha1(path).hexdigest()) + '.jpg'
-        else:
-            return os.path.join(ranger.args.cachedir,
-                                sha1(path.encode('utf-8', 'backslashreplace'))
-                                .hexdigest()) + '.jpg'
+        return os.path.join(ranger.args.cachedir,
+                            sha1(path.encode('utf-8', 'backslashreplace'))
+                            .hexdigest()) + '.jpg'
 
     def get_preview(self, fobj, width, height):  # pylint: disable=too-many-return-statements
         pager = self.ui.get_pager()
@@ -1181,7 +1180,7 @@ class Actions(  # pylint: disable=too-many-instance-attributes,too-many-public-m
             self.fm.select_file(file_selection)
 
     def _get_tab_list(self):
-        assert len(self.tabs) > 0, "There must be >=1 tabs at all times"
+        assert self.tabs, "There must be at least 1 tab at all times"
         return sorted(self.tabs)
 
     # --------------------------
diff --git a/ranger/core/fm.py b/ranger/core/fm.py
index a48d77da..0a0be874 100644
--- a/ranger/core/fm.py
+++ b/ranger/core/fm.py
@@ -113,7 +113,7 @@ class FM(Actions,  # pylint: disable=too-many-instance-attributes
         if not ranger.args.clean and self.tags is None:
             self.tags = Tags(self.confpath('tagged'))
         elif ranger.args.clean:
-            self.tags = TagsDummy("")  # pylint: disable=redefined-variable-type
+            self.tags = TagsDummy("")
 
         if self.bookmarks is None:
             if ranger.args.clean:
@@ -147,7 +147,7 @@ class FM(Actions,  # pylint: disable=too-many-instance-attributes
             from ranger.ext.shell_escape import shell_quote
 
             if self.settings.open_all_images and \
-                    len(self.thisdir.marked_items) == 0 and \
+                    not self.thisdir.marked_items and \
                     re.match(r'^(feh|sxiv|imv|pqiv) ', command):
 
                 images = [f.relative_path for f in self.thisdir.files if f.image]
@@ -228,8 +228,7 @@ class FM(Actions,  # pylint: disable=too-many-instance-attributes
             return URXVTImageDisplayer()
         elif self.settings.preview_images_method == "urxvt-full":
             return URXVTImageFSDisplayer()
-        else:
-            return ImageDisplayer()
+        return ImageDisplayer()
 
     def _get_thisfile(self):
         return self.thistab.thisfile
diff --git a/ranger/core/linemode.py b/ranger/core/linemode.py
index 97c6d4e6..e83dd10c 100644
--- a/ranger/core/linemode.py
+++ b/ranger/core/linemode.py
@@ -70,8 +70,7 @@ class TitleLinemode(LinemodeBase):
         name = metadata.title
         if metadata.year:
             return "%s - %s" % (metadata.year, name)
-        else:
-            return name
+        return name
 
     def infostring(self, fobj, metadata):
         if metadata.authors:
diff --git a/ranger/core/loader.py b/ranger/core/loader.py
index 6c4efc36..b4a97394 100644
--- a/ranger/core/loader.py
+++ b/ranger/core/loader.py
@@ -269,8 +269,7 @@ def safeDecode(string):  # pylint: disable=invalid-name
         if HAVE_CHARDET:
             codec = chardet.detect(string)["encoding"]
             return string.decode(codec, 'ignore')
-        else:
-            return ""
+        return ""
 
 
 class Loader(FileManagerAware):
diff --git a/ranger/core/main.py b/ranger/core/main.py
index b5735f3e..b3173da2 100644
--- a/ranger/core/main.py
+++ b/ranger/core/main.py
@@ -73,7 +73,7 @@ def main(
                 if len(line) > 2 and line[1] == ':':
                     if line[0] in args.list_tagged_files:
                         sys.stdout.write(line[2:])
-                elif len(line) > 0 and '*' in args.list_tagged_files:
+                elif line and '*' in args.list_tagged_files:
                     sys.stdout.write(line)
         return 1 if args.fail_unless_cd else 0  # COMPAT
 
diff --git a/ranger/core/metadata.py b/ranger/core/metadata.py
index b2a1be3a..238b709d 100644
--- a/ranger/core/metadata.py
+++ b/ranger/core/metadata.py
@@ -113,20 +113,21 @@ class MetadataManager(object):
 
     def _get_metafile_content(self, metafile):
         import json
+
         if metafile in self.metafile_cache:
             return self.metafile_cache[metafile]
-        else:
-            if exists(metafile):
-                with open(metafile, "r") as fobj:
-                    try:
-                        entries = json.load(fobj)
-                    except ValueError:
-                        raise ValueError("Failed decoding JSON file %s" %
-                                         metafile)
-                self.metafile_cache[metafile] = entries
-                return entries
-            else:
-                return {}
+
+        if exists(metafile):
+            with open(metafile, "r") as fobj:
+                try:
+                    entries = json.load(fobj)
+                except ValueError:
+                    raise ValueError("Failed decoding JSON file %s" %
+                                     metafile)
+            self.metafile_cache[metafile] = entries
+            return entries
+
+        return {}
 
     def _get_metafile_names(self, path):
         # Iterates through the paths of all .metadata.json files that could
diff --git a/ranger/ext/direction.py b/ranger/ext/direction.py
index f4f2c9f9..5d2341c2 100644
--- a/ranger/ext/direction.py
+++ b/ranger/ext/direction.py
@@ -54,7 +54,7 @@ class Direction(dict):
                 return fallback
 
     def up(self):  # pylint: disable=invalid-name
-        return -Direction.down(self)
+        return -Direction.down(self)  # pylint: disable=invalid-unary-operand-type
 
     def down(self):
         return Direction._get_direction(self, 'down', 'up')
@@ -66,7 +66,7 @@ class Direction(dict):
         return Direction._get_bool(self, 'absolute', 'relative')
 
     def left(self):
-        return -Direction.right(self)
+        return -Direction.right(self)  # pylint: disable=invalid-unary-operand-type
 
     def relative(self):
         return not Direction.absolute(self)
diff --git a/ranger/ext/img_display.py b/ranger/ext/img_display.py
index e1141409..01f61369 100644
--- a/ranger/ext/img_display.py
+++ b/ranger/ext/img_display.py
@@ -135,8 +135,7 @@ class W3MImageDisplayer(ImageDisplayer):
         except IOError as ex:
             if ex.errno == errno.EPIPE:
                 return
-            else:
-                raise ex
+            raise
         self.process.stdin.flush()
         self.process.stdout.readline()
 
@@ -245,16 +244,15 @@ class ITerm2ImageDisplayer(ImageDisplayer, FileManagerAware):
                 max_scale = max(width_scale, height_scale)
                 if width * max_scale <= max_width and height * max_scale <= max_height:
                     return width * max_scale
-                else:
-                    return width * min_scale
-            else:
-                scale = max_height / float(height)
-                return width * scale
+                return width * min_scale
+
+            scale = max_height / float(height)
+            return width * scale
         elif width > max_width:
             scale = max_width / float(width)
             return width * scale
-        else:
-            return width
+
+        return width
 
     @staticmethod
     def _encode_image_content(path):
diff --git a/ranger/ext/keybinding_parser.py b/ranger/ext/keybinding_parser.py
index 7430dfcf..b7816cf3 100644
--- a/ranger/ext/keybinding_parser.py
+++ b/ranger/ext/keybinding_parser.py
@@ -111,8 +111,8 @@ def parse_keybinding(obj):  # pylint: disable=too-many-branches
                             yield int(string)
                         else:
                             yield ord('<')
-                            for char in bracket_content:
-                                yield ord(char)
+                            for bracket_char in bracket_content:
+                                yield ord(bracket_char)
                             yield ord('>')
                     except TypeError:
                         yield keys  # it was no tuple, just an int
diff --git a/ranger/ext/logutils.py b/ranger/ext/logutils.py
index ce77360d..ff27b420 100644
--- a/ranger/ext/logutils.py
+++ b/ranger/ext/logutils.py
@@ -69,7 +69,7 @@ def setup_logging(debug=True, logfile=None):
     handlers = []
     handlers.append(QueueHandler(log_queue))
     if logfile:
-        if logfile is '-':
+        if logfile == '-':
             handlers.append(logging.StreamHandler())
         else:
             handlers.append(logging.FileHandler(logfile))
diff --git a/ranger/ext/openstruct.py b/ranger/ext/openstruct.py
index 19d10ebc..7528ee92 100644
--- a/ranger/ext/openstruct.py
+++ b/ranger/ext/openstruct.py
@@ -24,5 +24,4 @@ class DefaultOpenStruct(collections.defaultdict):
     def __getattr__(self, name):
         if name not in self.__dict__:
             return None
-        else:
-            return self.__dict__[name]
+        return self.__dict__[name]
diff --git a/ranger/ext/spawn.py b/ranger/ext/spawn.py
index dae532e4..ffb4d94b 100644
--- a/ranger/ext/spawn.py
+++ b/ranger/ext/spawn.py
@@ -68,5 +68,4 @@ def spawn(*popenargs, **kwargs):
     """
     if len(popenargs) == 1:
         return check_output(popenargs[0], **kwargs)
-    else:
-        return check_output(list(popenargs), **kwargs)
+    return check_output(list(popenargs), **kwargs)
diff --git a/ranger/ext/vcs/bzr.py b/ranger/ext/vcs/bzr.py
index 0f0c858d..753b5d05 100644
--- a/ranger/ext/vcs/bzr.py
+++ b/ranger/ext/vcs/bzr.py
@@ -43,7 +43,9 @@ class Bzr(Vcs):
             output = self._run(args)
         except VcsError:
             return None
+        # pylint: disable=no-member
         entries = re.findall(r'-+\n(.+?)\n(?:-|\Z)', output, re.MULTILINE | re.DOTALL)
+        # pylint: enable=no-member
 
         log = []
         for entry in entries:
diff --git a/ranger/ext/vcs/git.py b/ranger/ext/vcs/git.py
index 640d8bfe..c6cb2bf3 100644
--- a/ranger/ext/vcs/git.py
+++ b/ranger/ext/vcs/git.py
@@ -161,12 +161,13 @@ class Git(Vcs):
             return 'none'
 
         output = self._run(['rev-list', '--left-right', '{0:s}...{1:s}'.format(remote, head)])
+        # pylint: disable=no-member
         ahead = re.search(r'^>', output, flags=re.MULTILINE)
         behind = re.search(r'^<', output, flags=re.MULTILINE)
+        # pylint: enable=no-member
         if ahead:
             return 'diverged' if behind else 'ahead'
-        else:
-            return 'behind' if behind else 'sync'
+        return 'behind' if behind else 'sync'
 
     def data_branch(self):
         try:
diff --git a/ranger/gui/ansi.py b/ranger/gui/ansi.py
index 4d6cbeb5..e68e780a 100644
--- a/ranger/gui/ansi.py
+++ b/ranger/gui/ansi.py
@@ -41,13 +41,13 @@ def text_with_fg_bg_attr(ansi_text):  # pylint: disable=too-many-branches,too-ma
             for x256fg, x256bg, arg in codesplit_re.findall(attr_args + ';'):
                 # first handle xterm256 codes
                 try:
-                    if len(x256fg) > 0:           # xterm256 foreground
+                    if x256fg:                    # xterm256 foreground
                         fg = int(x256fg)
                         continue
-                    elif len(x256bg) > 0:         # xterm256 background
+                    elif x256bg:                  # xterm256 background
                         bg = int(x256bg)
                         continue
-                    elif len(arg) > 0:            # usual ansi code
+                    elif arg:                     # usual ansi code
                         n = int(arg)
                     else:                         # empty code means reset
                         n = 0
diff --git a/ranger/gui/bar.py b/ranger/gui/bar.py
index c1fd6ff9..730b7e27 100644
--- a/ranger/gui/bar.py
+++ b/ranger/gui/bar.py
@@ -40,7 +40,7 @@ class Bar(object):
 
         # remove elemets from the left until it fits
         if sumsize > wid:
-            while len(self.left) > 0:
+            while self.left:
                 leftsize -= len(self.left.pop(-1))
                 if leftsize + rightsize <= wid:
                     break
@@ -48,7 +48,7 @@ class Bar(object):
 
             # remove elemets from the right until it fits
             if sumsize > wid:
-                while len(self.right) > 0:
+                while self.right:
                     rightsize -= len(self.right.pop(0))
                     if leftsize + rightsize <= wid:
                         break
@@ -123,7 +123,7 @@ class ColoredString(object):
         self.string = WideString(string)
         self.lst = lst
         self.fixed = False
-        if not len(string) or not len(self.string.chars):
+        if not string or not self.string.chars:
             self.min_size = 0
         elif PY3:
             self.min_size = utf_char_width(string[0])
diff --git a/ranger/gui/colorscheme.py b/ranger/gui/colorscheme.py
index 87ba72e4..e077c2eb 100644
--- a/ranger/gui/colorscheme.py
+++ b/ranger/gui/colorscheme.py
@@ -120,7 +120,7 @@ def _colorscheme_name_to_class(signal):  # pylint: disable=too-many-branches
         if signal.previous and isinstance(signal.previous, ColorScheme):
             signal.value = signal.previous
         else:
-            signal.value = ColorScheme()  # pylint: disable=redefined-variable-type
+            signal.value = ColorScheme()
         raise Exception("Cannot locate colorscheme `%s'" % scheme_name)
     else:
         if usecustom:
diff --git a/ranger/gui/mouse_event.py b/ranger/gui/mouse_event.py
index b479e383..2fd77a41 100644
--- a/ranger/gui/mouse_event.py
+++ b/ranger/gui/mouse_event.py
@@ -41,13 +41,12 @@ class MouseEvent(object):
         # Recently it seems to have been fixed, as 2**21 was introduced as
         # the code for the "scroll down" button.
         if self.bstate & curses.BUTTON4_PRESSED:
-            return self.ctrl() and -self.CTRL_SCROLLWHEEL_MULTIPLIER or -1
+            return -self.CTRL_SCROLLWHEEL_MULTIPLIER if self.ctrl() else -1
         elif self.bstate & curses.BUTTON2_PRESSED \
                 or self.bstate & 2**21 \
                 or self.bstate > curses.ALL_MOUSE_EVENTS:
-            return self.ctrl() and self.CTRL_SCROLLWHEEL_MULTIPLIER or 1
-        else:
-            return 0
+            return self.CTRL_SCROLLWHEEL_MULTIPLIER if self.ctrl() else 1
+        return 0
 
     def ctrl(self):
         return self.bstate & curses.BUTTON_CTRL
diff --git a/ranger/gui/ui.py b/ranger/gui/ui.py
index 5c665b71..0b171ae6 100644
--- a/ranger/gui/ui.py
+++ b/ranger/gui/ui.py
@@ -207,7 +207,7 @@ class UI(  # pylint: disable=too-many-instance-attributes,too-many-public-method
 
     def handle_input(self):
         key = self.win.getch()
-        if key is 27 or key >= 128 and key < 256:
+        if key == 27 or (key >= 128 and key < 256):
             # Handle special keys like ALT+X or unicode here:
             keys = [key]
             previous_load_mode = self.load_mode
@@ -436,8 +436,7 @@ class UI(  # pylint: disable=too-many-instance-attributes,too-many-public-method
     def get_pager(self):
         if hasattr(self.browser, 'pager') and self.browser.pager.visible:
             return self.browser.pager
-        else:
-            return self.pager
+        return self.pager
 
     def _get_viewmode(self):
         return self._viewmode
diff --git a/ranger/gui/widgets/browsercolumn.py b/ranger/gui/widgets/browsercolumn.py
index ae59273b..578c61f8 100644
--- a/ranger/gui/widgets/browsercolumn.py
+++ b/ranger/gui/widgets/browsercolumn.py
@@ -388,8 +388,7 @@ class BrowserColumn(Pager):  # pylint: disable=too-many-instance-attributes
     def _get_index_of_selected_file(self):
         if self.fm.ui.viewmode == 'multipane' and hasattr(self, 'tab'):
             return self.tab.pointer
-        else:
-            return self.target.pointer
+        return self.target.pointer
 
     @staticmethod
     def _total_len(predisplay):
diff --git a/ranger/gui/widgets/console.py b/ranger/gui/widgets/console.py
index 349c904f..3c056aa9 100644
--- a/ranger/gui/widgets/console.py
+++ b/ranger/gui/widgets/console.py
@@ -380,7 +380,8 @@ class Console(Widget):  # pylint: disable=too-many-instance-attributes,too-many-
             if backward:
                 right_part = self.line[self.pos:]
                 i = self.pos - 2
-                while i >= 0 and re.match(r'[\w\d]', self.line[i], re.U):
+                while i >= 0 and re.match(
+                        r'[\w\d]', self.line[i], re.UNICODE):  # pylint: disable=no-member
                     i -= 1
                 self.copy = self.line[i + 1:self.pos]
                 self.line = self.line[:i + 1] + right_part
@@ -388,7 +389,8 @@ class Console(Widget):  # pylint: disable=too-many-instance-attributes,too-many-
             else:
                 left_part = self.line[:self.pos]
                 i = self.pos + 1
-                while i < len(self.line) and re.match(r'[\w\d]', self.line[i], re.U):
+                while i < len(self.line) and re.match(
+                        r'[\w\d]', self.line[i], re.UNICODE):  # pylint: disable=no-member
                     i += 1
                 self.copy = self.line[self.pos:i]
                 if i >= len(self.line):
@@ -457,8 +459,7 @@ class Console(Widget):  # pylint: disable=too-many-instance-attributes,too-many-
             cmd = self._get_cmd()
             if cmd:
                 return cmd.tab(tabnum)
-            else:
-                return None
+            return None
 
         return self.fm.commands.command_generator(self.line)
 
diff --git a/ranger/gui/widgets/pager.py b/ranger/gui/widgets/pager.py
index e214b587..4182b189 100644
--- a/ranger/gui/widgets/pager.py
+++ b/ranger/gui/widgets/pager.py
@@ -198,7 +198,7 @@ class Pager(Widget):  # pylint: disable=too-many-instance-attributes
         return True
 
     def click(self, event):
-        n = event.ctrl() and 1 or 3
+        n = 1 if event.ctrl() else 3
         direction = event.mouse_wheel_direction()
         if direction:
             self.move(down=direction * n)
@@ -229,7 +229,7 @@ class Pager(Widget):  # pylint: disable=too-many-instance-attributes
         while True:
             try:
                 line = self._get_line(i).expandtabs(4)
-                if self.markup is 'ansi':
+                if self.markup == 'ansi':
                     line = ansi.char_slice(line, startx, self.wid) + ansi.reset
                 else:
                     line = line[startx:self.wid + startx]
diff --git a/ranger/gui/widgets/statusbar.py b/ranger/gui/widgets/statusbar.py
index 632a1759..e17f131c 100644
--- a/ranger/gui/widgets/statusbar.py
+++ b/ranger/gui/widgets/statusbar.py
@@ -159,7 +159,7 @@ class StatusBar(Widget):  # pylint: disable=too-many-instance-attributes
             perms = '--%s--' % self.fm.mode.upper()
         else:
             perms = target.get_permission_string()
-        how = getuid() == stat.st_uid and 'good' or 'bad'
+        how = 'good' if getuid() == stat.st_uid else 'bad'
         left.add(perms, 'permissions', how)
         left.add_space()
         left.add(str(stat.st_nlink), 'nlink')
@@ -169,7 +169,7 @@ class StatusBar(Widget):  # pylint: disable=too-many-instance-attributes
         left.add(self._get_group(target), 'group')
 
         if target.is_link:
-            how = target.exists and 'good' or 'bad'
+            how = 'good' if target.exists else 'bad'
             try:
                 dest = readlink(target.path)
             except Exception:
@@ -286,7 +286,7 @@ class StatusBar(Widget):  # pylint: disable=too-many-instance-attributes
             # Indicate that there are marked files. Useful if you scroll
             # away and don't see them anymore.
             right.add('Mrk', base, 'marked')
-        elif len(target.files):
+        elif target.files:
             right.add(str(target.pointer + 1) + '/'
                       + str(len(target.files)) + '  ', base)
             if max_pos <= 0: