unnecessary map (auto-fix)

ruff 'C417' --unsafe-fixes

ruff-strict-pep8.toml

@@ -19,7 +19,7 @@ quote-style = 'single'
 [lint]
 ignore = [
     'E402', 'E722', 'E741',
-    'UP012', 'UP030', 'UP032', 'UP038', 'C408', 'C413', 'C417', 'C420',
+    'UP012', 'UP030', 'UP032', 'UP038', 'C408', 'C413', 'C420',
 ]
 select = [
     'E', 'F', 'I', 'W', 'INT',

setup/__init__.py

@@ -46,10 +46,10 @@ def newer(targets, sources):
     for f in targets:
         if not os.path.exists(f):
             return True
-    ttimes = map(lambda x: os.stat(x).st_mtime, targets)
+    ttimes = (os.stat(x).st_mtime for x in targets)
     oldest_target = min(ttimes)
     try:
-        stimes = map(lambda x: os.stat(x).st_mtime, sources)
+        stimes = (os.stat(x).st_mtime for x in sources)
         newest_source = max(stimes)
     except FileNotFoundError:
         newest_source = oldest_target +1

src/calibre/db/categories.py

@@ -279,7 +279,7 @@ def get_categories(dbcache, sort='name', book_ids=None, first_letter_sort=False,
         # temporarily duplicating the categories lists.
         taglist = {}
         for c, items in iteritems(categories):
-            taglist[c] = dict(map(lambda t:(icu_lower(t.name), t), items))
+            taglist[c] = {icu_lower(t.name): t for t in items}
 
         # Add the category values to the user categories
         for user_cat in sorted(user_categories, key=sort_key):

src/calibre/db/cli/cmd_list.py

@@ -205,7 +205,7 @@ def do_list(
     from calibre.utils.terminal import ColoredStream, geometry
 
     output_table = prepare_output_table(fields, book_ids, data, metadata)
-    widths = list(map(lambda x: 0, fields))
+    widths = [0 for x in fields]
 
     for record in output_table:
         for j in range(len(fields)):
@@ -215,7 +215,7 @@ def do_list(
     if not screen_width:
         screen_width = 80
     field_width = screen_width // len(fields)
-    base_widths = list(map(lambda x: min(x + 1, field_width), widths))
+    base_widths = [min(x + 1, field_width) for x in widths]
 
     while sum(base_widths) < screen_width:
         adjusted = False

src/calibre/db/cli/cmd_list_categories.py

@@ -74,7 +74,7 @@ def do_list(fields, data, opts):
     from calibre.utils.terminal import ColoredStream, geometry
 
     separator = ' '
-    widths = list(map(lambda x: 0, fields))
+    widths = [0 for x in fields]
     for i in data:
         for j, field in enumerate(fields):
             widths[j] = max(widths[j], max(len(field), len(str(i[field]))))
@@ -83,7 +83,7 @@ def do_list(fields, data, opts):
     if not screen_width:
         screen_width = 80
     field_width = screen_width // len(fields)
-    base_widths = list(map(lambda x: min(x + 1, field_width), widths))
+    base_widths = [min(x + 1, field_width) for x in widths]
 
     while sum(base_widths) < screen_width:
         adjusted = False
@@ -104,7 +104,7 @@ def do_list(fields, data, opts):
     with ColoredStream(sys.stdout, fg='green'):
         prints(''.join(titles))
 
-    wrappers = list(map(lambda x: TextWrapper(x - 1), widths))
+    wrappers = [TextWrapper(x - 1) for x in widths]
 
     for record in data:
         text = [

src/calibre/db/tests/base.py

@@ -110,7 +110,7 @@ class BaseTest(unittest.TestCase):
                 continue
             attr1, attr2 = getattr(mi1, attr), getattr(mi2, attr)
             if attr == 'formats':
-                attr1, attr2 = map(lambda x:tuple(x) if x else (), (attr1, attr2))
+                attr1, attr2 = (tuple(x) if x else () for x in (attr1, attr2))
             if isinstance(attr1, (tuple, list)) and 'authors' not in attr and 'languages' not in attr:
                 attr1, attr2 = set(attr1), set(attr2)
             self.assertEqual(attr1, attr2,

src/calibre/devices/kindle/apnx_page_generator/pages.py

@@ -34,10 +34,10 @@ class Pages:
 
     @property
     def page_locations(self) -> list[int]:
-        return list(itertools.chain.from_iterable(list(map(lambda pg: pg.page_locations, self.__pages_groups))))
+        return list(itertools.chain.from_iterable([pg.page_locations for pg in self.__pages_groups]))
 
     @property
     def number_of_pages(self) -> int:
-        return sum(list(map(lambda pg: len(pg.page_locations), self.__pages_groups)))
+        return sum([len(pg.page_locations) for pg in self.__pages_groups])
 
 

src/calibre/ebooks/conversion/plugins/epub_output.py

@@ -452,7 +452,7 @@ class EPUBOutput(OutputFormatPlugin):
                     br.tag = XHTML('p')
                     br.text = '\u00a0'
                     style = br.get('style', '').split(';')
-                    style = list(filter(None, map(lambda x: x.strip(), style)))
+                    style = list(filter(None, (x.strip() for x in style)))
                     style.append('margin:0pt; border:0pt')
                     # If the prior tag is a block (including a <br> we replaced)
                     # then this <br> replacement should have a 1-line height.

src/calibre/ebooks/metadata/opf2.py

@@ -1432,9 +1432,8 @@ class OPFCreator(Metadata):
 
         `entries`: List of (path, mime-type) If mime-type is None it is autodetected
         '''
-        entries = list(map(lambda x: x if os.path.isabs(x[0]) else
-                      (os.path.abspath(os.path.join(self.base_path, x[0])), x[1]),
-                      entries))
+        entries = [x if os.path.isabs(x[0]) else
+                      (os.path.abspath(os.path.join(self.base_path, x[0])), x[1]) for x in entries]
         self.manifest = Manifest.from_paths(entries)
         self.manifest.set_basedir(self.base_path)
 
@@ -1464,8 +1463,8 @@ class OPFCreator(Metadata):
 
         `entries`: List of paths
         '''
-        entries = list(map(lambda x: x if os.path.isabs(x) else
-                      os.path.abspath(os.path.join(self.base_path, x)), entries))
+        entries = [x if os.path.isabs(x) else
+                      os.path.abspath(os.path.join(self.base_path, x)) for x in entries]
         self.spine = Spine.from_paths(entries, self.manifest)
 
     def set_toc(self, toc):

src/calibre/ebooks/metadata/xmp.py

@@ -495,7 +495,7 @@ def metadata_to_xmp_packet(mi):
     if not mi.is_null('pubdate'):
         create_sequence_property(dc, 'dc:date', [isoformat(mi.pubdate, as_utc=False)])  # Adobe spec recommends local time
     if not mi.is_null('languages'):
-        langs = list(filter(None, map(lambda x:lang_as_iso639_1(x) or canonicalize_lang(x), mi.languages)))
+        langs = list(filter(None, (lang_as_iso639_1(x) or canonicalize_lang(x) for x in mi.languages)))
         if langs:
             create_sequence_property(dc, 'dc:language', langs, ordered=False)
 

src/calibre/ebooks/mobi/utils.py

@@ -647,4 +647,4 @@ def convert_color_for_font_tag(val):
     def clamp(x):
         return min(x, max(0, x), 1)
     rgb = map(clamp, rgba[:3])
-    return '#' + ''.join(map(lambda x:'%02x' % int(x * 255), rgb))
+    return '#' + ''.join(('%02x' % int(x * 255) for x in rgb))

src/calibre/ebooks/pdb/haodoo/reader.py

@@ -60,9 +60,7 @@ class LegacyHeaderRecord:
         fields = raw.lstrip().replace(b'\x1b\x1b\x1b', b'\x1b').split(b'\x1b')
         self.title = fix_punct(fields[0].decode('cp950', 'replace'))
         self.num_records = int(fields[1])
-        self.chapter_titles = list(map(
-            lambda x: fix_punct(x.decode('cp950', 'replace').rstrip('\x00')),
-            fields[2:]))
+        self.chapter_titles = [fix_punct(x.decode('cp950', 'replace').rstrip('\x00')) for x in fields[2:]]
 
 
 class UnicodeHeaderRecord:
@@ -72,9 +70,7 @@ class UnicodeHeaderRecord:
                 b'\x1b\x00').split(b'\x1b\x00')
         self.title = fix_punct(fields[0].decode('utf_16_le', 'ignore'))
         self.num_records = int(fields[1])
-        self.chapter_titles = list(map(
-            lambda x: fix_punct(x.decode('utf_16_le', 'replace').rstrip('\x00')),
-            fields[2].split(b'\r\x00\n\x00')))
+        self.chapter_titles = [fix_punct(x.decode('utf_16_le', 'replace').rstrip('\x00')) for x in fields[2].split(b'\r\x00\n\x00')]
 
 
 class Reader(FormatReader):

src/calibre/ebooks/pdf/render/gradients.py

@@ -79,7 +79,7 @@ class LinearGradientPattern(Dictionary):
                         matrix):
         start = gradient.start()
         stop = gradient.finalStop()
-        stops = list(map(lambda x: [x[0], x[1].getRgbF()], gradient.stops()))
+        stops = [[x[0], x[1].getRgbF()] for x in gradient.stops()]
         spread = gradient.spread()
         if spread != gradient.PadSpread:
             inv = matrix.inverted()[0]

src/calibre/gui2/dialogs/metadata_bulk.py

@@ -660,10 +660,8 @@ class MetadataBulkDialog(QDialog, Ui_MetadataBulkDialog):
         self.button_transform_publishers.clicked.connect(self.transform_publishers)
         self.button_transform_series.clicked.connect(self.transform_series)
         self.tag_map_rules = self.author_map_rules = self.publisher_map_rules = self.series_map_rules = ()
-        tuple(map(lambda b: (b.clicked.connect(self.clear_transform_rules_for), b.setIcon(QIcon.ic('clear_left.png')), b.setToolTip(_(
-            'Clear the rules'))),
-            (self.button_clear_tags_rules, self.button_clear_authors_rules, self.button_clear_publishers_rules)
-        ))
+        tuple(((b.clicked.connect(self.clear_transform_rules_for), b.setIcon(QIcon.ic('clear_left.png')), b.setToolTip(_(
+            'Clear the rules'))) for b in (self.button_clear_tags_rules, self.button_clear_authors_rules, self.button_clear_publishers_rules)))
         self.update_transform_labels()
         if starting_tab < 0:
             starting_tab = gprefs.get('bulk_metadata_window_tab', 0)

src/calibre/gui2/dialogs/search.py

@@ -505,8 +505,7 @@ class SearchDialog(QDialog):
             self.mc = '~'
         else:
             self.mc = '^'
-        all, any, phrase, none = map(lambda x: str(x.text()),
-                (self.all, self.any, self.phrase, self.none))
+        all, any, phrase, none = (str(x.text()) for x in (self.all, self.any, self.phrase, self.none))
         all, any, none = map(self.tokens, (all, any, none))
         phrase = phrase.strip()
         all = ' and '.join(all)

src/calibre/gui2/dialogs/template_dialog_code_widget.py

@@ -59,7 +59,7 @@ class CodeEditor(QPlainTextEdit):
     def line_number_area_width(self):
         # get largest width of digits
         fm = self.fontMetrics()
-        self.number_width = max(map(lambda x:fm.horizontalAdvance(str(x)), range(10)))
+        self.number_width = max((fm.horizontalAdvance(str(x)) for x in range(10)))
         digits = 1
         limit = max(1, self.blockCount())
         while limit >= 10:

src/calibre/gui2/preferences/columns.py

@@ -107,9 +107,7 @@ class ConfigWidget(ConfigWidgetBase, Ui_Form):
         self.opt_columns.verticalHeader().hide()
 
         self.opt_columns.setRowCount(len(colmap))
-        self.column_desc = dict(map(lambda x:(CreateCustomColumn.column_types[x]['datatype'],
-                                         CreateCustomColumn.column_types[x]['text']),
-                                  CreateCustomColumn.column_types))
+        self.column_desc = {CreateCustomColumn.column_types[x]['datatype']: CreateCustomColumn.column_types[x]['text'] for x in CreateCustomColumn.column_types}
 
         for row, key in enumerate(colmap):
             self.setup_row(row, key, row)

src/calibre/gui2/preferences/create_custom_column.py

@@ -157,8 +157,7 @@ class CreateCustomColumn(QDialog):
             ct = '*' + ct
         self.orig_column_number = c['colnum']
         self.orig_column_name = col
-        column_numbers = dict(map(lambda x:(self.column_types[x]['datatype'], x),
-                                  self.column_types))
+        column_numbers = {self.column_types[x]['datatype']: x for x in self.column_types}
         self.column_type_box.setCurrentIndex(column_numbers[ct])
         self.column_type_box.setEnabled(False)
 

src/calibre/gui2/preferences/look_feel.py

@@ -236,7 +236,7 @@ class IdLinksEditor(Dialog):
     def edit_rule(self, r=-1):
         key = name = template = ''
         if r > -1:
-            key, name, template = map(lambda c: self.table.item(r, c).text(), range(3))
+            key, name, template = (self.table.item(r, c).text() for c in range(3))
         d = IdLinksRuleEdit(key, name, template, self)
         if d.exec() == QDialog.DialogCode.Accepted:
             if r < 0:

src/calibre/gui2/preferences/texture_chooser.py

@@ -86,7 +86,7 @@ class TextureChooser(QDialog):
         images = [{
             'fname': ':'+os.path.basename(x),
             'path': x,
-            'name': ' '.join(map(lambda s: s.capitalize(), os.path.splitext(os.path.basename(x))[0].split('_')))
+            'name': ' '.join((s.capitalize() for s in os.path.splitext(os.path.basename(x))[0].split('_')))
         } for x in glob.glob(I('textures/*.png'))] + [{
             'fname': os.path.basename(x),
             'path': x,

src/calibre/gui2/search_box.py

@@ -363,9 +363,7 @@ class SearchBoxMixin:  # {{{
         self.search.clear()
         self.search.setMaximumWidth(self.width()-150)
         self.action_focus_search = QAction(self)
-        shortcuts = list(
-                map(lambda x:str(x.toString(QKeySequence.SequenceFormat.PortableText)),
-                QKeySequence.keyBindings(QKeySequence.StandardKey.Find)))
+        shortcuts = [str(x.toString(QKeySequence.SequenceFormat.PortableText)) for x in QKeySequence.keyBindings(QKeySequence.StandardKey.Find)]
         shortcuts += ['/', 'Alt+S']
         self.keyboard.register_shortcut('start search', _('Start search'),
                 default_keys=shortcuts, action=self.action_focus_search)

src/calibre/gui2/store/config/chooser/adv_search_builder.py

@@ -73,8 +73,7 @@ class AdvSearchBuilderDialog(QDialog, Ui_Dialog):
             self.mc = '='
         else:
             self.mc = '~'
-        all, any, phrase, none = map(lambda x: str(x.text()),
-                (self.all, self.any, self.phrase, self.none))
+        all, any, phrase, none = (str(x.text()) for x in (self.all, self.any, self.phrase, self.none))
         all, any, none = map(self.tokens, (all, any, none))
         phrase = phrase.strip()
         all = ' and '.join(all)

src/calibre/gui2/store/search/adv_search_builder.py

@@ -80,8 +80,7 @@ class AdvSearchBuilderDialog(QDialog, Ui_Dialog):
             self.mc = '='
         else:
             self.mc = '~'
-        all, any, phrase, none = list(map(lambda x: str(x.text()),
-                (self.all, self.any, self.phrase, self.none)))
+        all, any, phrase, none = [str(x.text()) for x in (self.all, self.any, self.phrase, self.none)]
         all, any, none = list(map(self.tokens, (all, any, none)))
         phrase = phrase.strip()
         all = ' and '.join(all)

src/calibre/gui2/store/stores/mobileread/adv_search_builder.py

@@ -73,8 +73,7 @@ class AdvSearchBuilderDialog(QDialog, Ui_Dialog):
             self.mc = '='
         else:
             self.mc = '~'
-        all, any, phrase, none = list(map(lambda x: type(u'')(x.text()),
-                (self.all, self.any, self.phrase, self.none)))
+        all, any, phrase, none = [type(u'')(x.text()) for x in (self.all, self.any, self.phrase, self.none)]
         all, any, none = list(map(self.tokens, (all, any, none)))
         phrase = phrase.strip()
         all = ' and '.join(all)

src/calibre/gui2/tweak_book/diff/view.py

@@ -181,7 +181,7 @@ class TextBrowser(PlainTextEdit):  # {{{
 
     def calculate_metrics(self):
         fm = self.fontMetrics()
-        self.number_width = max(map(lambda x:fm.horizontalAdvance(str(x)), range(10)))
+        self.number_width = max((fm.horizontalAdvance(str(x)) for x in range(10)))
         self.space_width = fm.horizontalAdvance(' ')
 
     def show_context_menu(self, pos):

src/calibre/gui2/tweak_book/editor/text.py

@@ -282,7 +282,7 @@ class TextEdit(PlainTextEdit):
         self.setFont(font)
         self.highlighter.apply_theme(theme)
         fm = self.fontMetrics()
-        self.number_width = max(map(lambda x:fm.horizontalAdvance(str(x)), range(10)))
+        self.number_width = max((fm.horizontalAdvance(str(x)) for x in range(10)))
         self.size_hint = QSize(self.expected_geometry[0] * fm.averageCharWidth(), self.expected_geometry[1] * fm.height())
         self.highlight_color = theme_color(theme, 'HighlightRegion', 'bg')
         self.highlight_cursor_line()

src/calibre/library/database2.py

@@ -2119,7 +2119,7 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
         # temporarily duplicating the categories lists.
         taglist = {}
         for c in categories.keys():
-            taglist[c] = dict(map(lambda t:(icu_lower(t.name), t), categories[c]))
+            taglist[c] = {icu_lower(t.name): t for t in categories[c]}
 
         muc = self.prefs.get('grouped_search_make_user_categories', [])
         gst = self.prefs.get('grouped_search_terms', {})

src/calibre/srv/http_response.py

@@ -69,7 +69,7 @@ def parse_multipart_byterange(buf, content_type):  # {{{
         if not cr.startswith('bytes '):
             raise ValueError('Malformed Content-Range header in sub-part, no prefix')
         try:
-            start, stop = map(lambda x: int(x.strip()), cr.partition(' ')[-1].partition('/')[0].partition('-')[::2])
+            start, stop = (int(x.strip()) for x in cr.partition(' ')[-1].partition('/')[0].partition('-')[::2])
         except Exception:
             raise ValueError('Malformed Content-Range header in sub-part, failed to parse byte range')
         content_length = stop - start + 1

src/calibre/srv/tests/auth.py

@@ -131,7 +131,7 @@ class TestAuth(BaseTest):
         opts = Options(userdb=':memory:')
         Data = namedtuple('Data', 'username')
         with TemporaryDirectory() as base:
-            l1, l2, l3 = map(lambda x: os.path.join(base, 'l' + x), '123')
+            l1, l2, l3 = (os.path.join(base, 'l' + x) for x in '123')
             for l in (l1, l2, l3):
                 create_backend(l).close()
             ctx = Handler((l1, l2, l3), opts).router.ctx

src/calibre/srv/tests/loop.py

@@ -198,7 +198,7 @@ class LoopTest(BaseTest):
         'Test serving over SSL'
         address = '127.0.0.1'
         with TemporaryDirectory('srv-test-ssl') as tdir:
-            cert_file, key_file, ca_file = map(lambda x:os.path.join(tdir, x), 'cka')
+            cert_file, key_file, ca_file = (os.path.join(tdir, x) for x in 'cka')
             create_server_cert(address, ca_file, cert_file, key_file, key_size=2048)
             ctx = ssl.create_default_context(cafile=ca_file)
             ctx.verify_flags |= ssl.VERIFY_X509_STRICT

src/calibre/srv/users.py

@@ -36,8 +36,8 @@ def parse_restriction(raw):
     lr = r.get('library_restrictions', {})
     if not isinstance(lr, dict):
         lr = {}
-    r['allowed_library_names'] = frozenset(map(lambda x: x.lower(), r.get('allowed_library_names', ())))
-    r['blocked_library_names'] = frozenset(map(lambda x: x.lower(), r.get('blocked_library_names', ())))
+    r['allowed_library_names'] = frozenset((x.lower() for x in r.get('allowed_library_names', ())))
+    r['blocked_library_names'] = frozenset((x.lower() for x in r.get('blocked_library_names', ())))
     r['library_restrictions'] = {k.lower(): v or '' for k, v in iteritems(lr)}
     return r
 

src/calibre/test_build.py

@@ -344,7 +344,7 @@ class BuildTest(unittest.TestCase):
         # package. On non-frozen builds, it should just work because the
         # hard-coded paths of the Qt installation should work. If they do not,
         # then it is a distro problem.
-        fmts = set(map(lambda x: x.data().decode('utf-8'), QImageReader.supportedImageFormats()))  # no2to3
+        fmts = {x.data().decode('utf-8') for x in QImageReader.supportedImageFormats()}  # no2to3
         testf = {'jpg', 'png', 'svg', 'ico', 'gif', 'webp'}
         self.assertEqual(testf.intersection(fmts), testf, "Qt doesn't seem to be able to load some of its image plugins. Available plugins: %s" % fmts)
         data = P('images/blank.png', allow_user_override=False, data=True)

src/calibre/utils/matcher.py

@@ -99,7 +99,7 @@ class Matcher:
                 w = [Worker(requests, results) for i in range(max(1, cpu_count()))]
                 [x.start() for x in w]
                 workers.extend(w)
-        items = map(lambda x: normalize('NFC', str(x)), filter(None, items))
+        items = (normalize('NFC', str(x)) for x in filter(None, items))
         self.items = items = tuple(items)
         tasks = split(items, len(workers))
         self.task_maps = [{j: i for j, (i, _) in enumerate(task)} for task in tasks]