pep8 and misc cleanups

src/calibre/ebooks/metadata/book/base.py

@@ -753,8 +753,8 @@ class Metadata:
                 res = human_readable(res)
             return (name, str(res), orig_res, fmeta)
 
-        if self.get(key, None):
-            return (key, str(self.get(key)), self.get(key), None)
+        if kv := self.get(key, None):
+            return (key, str(kv), kv, None)
 
         return (None, None, None, None)
 

src/calibre/ebooks/metadata/book/render.py

@@ -69,17 +69,21 @@ def search_action_with_data(search_term, value, book_id, field=None, **k):
 
 def cc_search_action_with_data(search_term, value, book_id, fm, mi, field=None,  **k):
     if mi is not None and fm is not None:
-        template = fm.get('display', {}).get('web_search_template')
-        if template:
+        if template := fm.get('display', {}).get('web_search_template'):
+            try:
                 formatter = SafeFormat()
                 mi.set('item_value', value)
-            u = formatter.safe_format(template, mi, "BOOK DETAILS WEB LINK", mi)
+                u = formatter.safe_format(template, mi, 'BOOK DETAILS WEB LINK', mi)
                 if u:
-                v = prepare_string_for_xml(_('Click to browse to {0}').format(u), attribute=True)
+                    v = prepare_string_for_xml(_('Click to browse to {}').format(u), attribute=True)
                     return action('cc_url', url=u), v
+            except Exception:
+                import traceback
+                traceback.print_exc()
     t = _('Click to see books with {0}: {1}').format(mi.get('name', search_term), prepare_string_for_xml(value))
     return search_action_with_data(search_term, value, book_id, **k), t
 
+
 def notes_action(**keys):
     return 'notes:' + as_hex_unicode(json_dumps(keys))
 
@@ -226,7 +230,7 @@ def mi_to_html(
                 else:
                     if not metadata['is_multiple']:
                         u, v = cc_search_action_with_data(field, val, book_id, metadata, mi, field)
-                        val = '<a href="{}" title="{}">{}</a>'.format(u, v, p(val))
+                        val = f'<a href="{u}" title="{v}">{p(val)}</a>'
                     else:
                         all_vals = [v.strip()
                             for v in val.split(metadata['is_multiple']['cache_to_list']) if v.strip()]
@@ -234,7 +238,7 @@ def mi_to_html(
                             links = []
                             for x in all_vals:
                                 u, v = cc_search_action_with_data(field, x, book_id, metadata, mi, field)
-                                links.append('<a href="{}" title="{}">{}</a>'.format(u, v, p(x)))
+                                links.append(f'<a href="{u}" title="{v}">{p(x)}</a>')
                         else:
                             links = all_vals
                         val = value_list(metadata['is_multiple']['list_to_ui'], links)
@@ -406,7 +410,7 @@ def mi_to_html(
                             for x in all_vals:
                                 if metadata['is_custom']:
                                     u, v = cc_search_action_with_data(field, x, book_id, metadata, mi, field)
-                                    v = '<a href="{}" title="{}">{}</a>'.format(u, v, p(x))
+                                    v = f'<a href="{u}" title="{v}">{p(x)}</a>'
                                 else:
                                     v = '<a href="{}" title="{}">{}</a>'.format(
                                         search_action_with_data(st, x, book_id, field),
@@ -425,7 +429,7 @@ def mi_to_html(
                         if show_links:
                             if metadata['is_custom']:
                                 u, v = cc_search_action_with_data(st, x, book_id, metadata, mi, field)
-                                v = '<a href="{}" title="{}">{}</a>'.format(u, v, p(x))
+                                v = f'<a href="{u}" title="{v}">{p(x)}</a>'
                             else:
                                 v = '<a href="{}" title="{}">{}</a>'.format(
                                     search_action_with_data(st, x, book_id, field),
@@ -436,7 +440,7 @@ def mi_to_html(
                         val = v + add_other_links(field, val)
                 elif metadata['datatype'] == 'enumeration':
                     u, v = cc_search_action_with_data(field, x, book_id, metadata, mi, field)
-                    val = '<a href="{}" title="{}">{}</a>'.format(u, v, p(x)) + add_other_links(field, val)
+                    val = f'<a href="{u}" title="{v}">{p(x)}</a>' + add_other_links(field, val)
                 elif metadata['datatype'] == 'bool':
                     val = '<a href="{}" title="{}">{}</a>'.format(
                         search_action_with_data(field, val, book_id, None), a(

src/calibre/gui2/preferences/look_feel_tabs/__init__.py

@@ -7,7 +7,21 @@ __docformat__ = 'restructuredtext en'
 
 import json
 
-from qt.core import QAbstractListModel, QComboBox, QDialog, QFormLayout, QHBoxLayout, QIcon, QItemSelectionModel, QLineEdit, Qt, QToolButton, QVBoxLayout, QWidget, pyqtSignal
+from qt.core import (
+    QAbstractListModel,
+    QComboBox,
+    QDialog,
+    QFormLayout,
+    QHBoxLayout,
+    QIcon,
+    QItemSelectionModel,
+    QLineEdit,
+    Qt,
+    QToolButton,
+    QVBoxLayout,
+    QWidget,
+    pyqtSignal,
+)
 
 from calibre.ebooks.metadata.book.render import DEFAULT_AUTHOR_LINK
 from calibre.ebooks.metadata.search_internet import qquote