diff --git a/Orange/widgets/data/owcsvimport.py b/Orange/widgets/data/owcsvimport.py
index 803d2bb8c36..6d5bb068b41 100644
--- a/Orange/widgets/data/owcsvimport.py
+++ b/Orange/widgets/data/owcsvimport.py
@@ -40,8 +40,8 @@
 )
 from PyQt5.QtWidgets import (
     QLabel, QComboBox, QPushButton, QDialog, QDialogButtonBox, QGridLayout,
-    QVBoxLayout, QSizePolicy, QStyle, QFileIconProvider, QFileDialog,
-    QApplication, QMessageBox, QTextBrowser, QMenu
+    QVBoxLayout, QSizePolicy, QFileIconProvider, QFileDialog,
+    QApplication, QMessageBox, QTextBrowser
 )
 from PyQt5.QtCore import pyqtSlot as Slot, pyqtSignal as Signal
 
@@ -956,7 +956,7 @@ def _path_must_be_relative_mb(self, prefix: str) -> QMessageBox:
         return mb
 
     @Slot()
-    def browse(self, prefixname=None, directory=None):
+    def browse(self):
         """
         Open a file dialog and select a user specified file.
         """
@@ -984,7 +984,7 @@ def browse(self, prefixname=None, directory=None):
             if not mtype.inherits("text/plain"):
                 mb = self._might_be_binary_mb(path)
                 if mb.exec() == QMessageBox.Cancel:
-                    return
+                    return False
             # initialize dialect based on selected format
             dialect, header = default_options_for_mime_type(
                 path, selected_filter.mime_type,
@@ -1470,7 +1470,7 @@ def __init__(self, dialect: csv.Dialect):
         super().__init__()
         self.dialect = dialect
 
-    def sniff(self, *_args, **_kwargs):  # pylint: disable=signature-differs
+    def sniff(self, *_args, **_kwargs):  # pylint: disable=signature-differs, arguments-differ
         # return fixed constant dialect, has_header sniffs dialect itself,
         # so it can't detect headers for a predefined dialect
         return self.dialect
@@ -1838,8 +1838,7 @@ def emitProgressChangedOrCancel(self, current, total):
         """
         if self.cancel:
             raise TaskState.UserCancelException()
-        else:
-            self.__progressChanged.emit(current, total)
+        self.__progressChanged.emit(current, total)
 
 
 class TextReadWrapper(io.TextIOWrapper):
diff --git a/Orange/widgets/utils/textimport.py b/Orange/widgets/utils/textimport.py
index be61957f6ec..0c551f2541b 100644
--- a/Orange/widgets/utils/textimport.py
+++ b/Orange/widgets/utils/textimport.py
@@ -37,7 +37,7 @@
 )
 
 from PyQt5.QtCore import (
-    Qt, QSize, QPoint, QRect, QRectF, QRegExp, QAbstractTableModel,
+    Qt, QSize, QRect, QRectF, QRegExp, QAbstractTableModel,
     QModelIndex, QItemSelectionModel, QTextBoundaryFinder, QTimer, QEvent
 )
 from PyQt5.QtCore import pyqtSignal as Signal, pyqtSlot as Slot
@@ -1127,7 +1127,6 @@ def __generate_type_columns_menu(self, columns, menu=None):
             current = None
         cb = self.column_type_edit_cb
         g = QActionGroup(menu)
-        current_action = None
         # 'Copy' the column types model into a menu
         for i in range(cb.count()):
             if cb.itemData(i, Qt.AccessibleDescriptionRole) == "separator":
@@ -1139,7 +1138,6 @@ def __generate_type_columns_menu(self, columns, menu=None):
             ac.setCheckable(True)
             if ac.data() == current:
                 ac.setChecked(True)
-                current_action = ac
             g.addAction(ac)
 
         def update_types(action):
@@ -1478,6 +1476,7 @@ def columntype_for_vartype(vartype):
         return ColumnType.Text
     if vartype == TimeVariable:
         return ColumnType.Time
+    raise ValueError
 
 
 class SkipItemDelegate(PreviewItemDelegate):