# Buggy code
def createEditor(self, parent, option, index, object_explorer=False):
    """Overriding method createEditor"""
    val_type = index.sibling(index.row(), 1).data()
    self.sig_open_editor.emit()
    if index.column() < 3:
        return None
    if self.show_warning(index):
        answer = QMessageBox.warning(
            self.parent(),
            _("Warning"),
            _("Opening this variable can be slow\n\nDo you want to continue anyway?"),
            QMessageBox.Yes | QMessageBox.No,
        )
        if answer == QMessageBox.No:
            return None
    try:
        value = self.get_value(index)
        if value is None:
            return None
    except ImportError as msg:
        self.sig_editor_shown.emit()
        module = str(msg).split("'")[1]
        if module in ["pandas", "numpy"]:
            if module == "numpy":
                val_type = "array"
            else:
                val_type = "dataframe, series"
            QMessageBox.critical(
                self.parent(),
                _("Error"),
                _(
                    "Spyder is unable to show the {val_type} or object "
                    "you're trying to view because <tt>{module}</tt> was "
                    "not installed alongside Spyder. Please install "
                    "this package in your Spyder environment."
                    "<br>"
                ).format(val_type=val_type, module=module),
            )
            return
        else:
            QMessageBox.critical(
                self.parent(),
                _("Error"),
                _(
                    "Spyder is unable to show the variable you're "
                    "trying to view because the module "
                    "<tt>{module}</tt> was not found in your  "
                    "Spyder environment. Please install "
                    "this package in your Spyder environment."
                    "<br>"
                ).format(module=module),
            )
            return
    except Exception as msg:
        QMessageBox.critical(
            self.parent(),
            _("Error"),
            _(
                "Spyder was unable to retrieve the value of "
                "this variable from the console.<br><br>"
                "The error message was:<br>"
                "%s"
            )
            % to_text_string(msg),
        )
        return

    key = index.model().get_key(index)
    readonly = (
        isinstance(value, (tuple, set))
        or self.parent().readonly
        or not is_known_type(value)
    )
    # CollectionsEditor for a list, tuple, dict, etc.
    if isinstance(value, (list, set, tuple, dict)) and not object_explorer:
        from spyder.plugins.variableexplorer.widgets.collectionseditor import (
            CollectionsEditor,
        )

        editor = CollectionsEditor(parent=parent)
        editor.setup(value, key, icon=self.parent().windowIcon(), readonly=readonly)
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None
    # ArrayEditor for a Numpy array
    elif (
        isinstance(value, (ndarray, MaskedArray))
        and ndarray is not FakeObject
        and not object_explorer
    ):
        editor = ArrayEditor(parent=parent)
        if not editor.setup_and_check(value, title=key, readonly=readonly):
            return
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None
    # ArrayEditor for an images
    elif (
        isinstance(value, Image)
        and ndarray is not FakeObject
        and Image is not FakeObject
        and not object_explorer
    ):
        arr = array(value)
        editor = ArrayEditor(parent=parent)
        if not editor.setup_and_check(arr, title=key, readonly=readonly):
            return
        conv_func = lambda arr: Image.fromarray(arr, mode=value.mode)
        self.create_dialog(
            editor,
            dict(
                model=index.model(),
                editor=editor,
                key=key,
                readonly=readonly,
                conv=conv_func,
            ),
        )
        return None
    # DataFrameEditor for a pandas dataframe, series or index
    elif (
        isinstance(value, (DataFrame, Index, Series))
        and DataFrame is not FakeObject
        and not object_explorer
    ):
        editor = DataFrameEditor(parent=parent)
        if not editor.setup_and_check(value, title=key):
            return
        editor.dataModel.set_format(index.model().dataframe_format)
        editor.sig_option_changed.connect(self.change_option)
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None
    # QDateEdit and QDateTimeEdit for a dates or datetime respectively
    elif isinstance(value, datetime.date) and not object_explorer:
        # Needed to handle NaT values
        # See spyder-ide/spyder#8329
        try:
            value.time()
        except ValueError:
            self.sig_editor_shown.emit()
            return None
        if readonly:
            self.sig_editor_shown.emit()
            return None
        else:
            if isinstance(value, datetime.datetime):
                editor = QDateTimeEdit(value, parent=parent)
            else:
                editor = QDateEdit(value, parent=parent)
            editor.setCalendarPopup(True)
            editor.setFont(get_font(font_size_delta=DEFAULT_SMALL_DELTA))
            self.sig_editor_shown.emit()
            return editor
    # TextEditor for a long string
    elif is_text_string(value) and len(value) > 40 and not object_explorer:
        te = TextEditor(None, parent=parent)
        if te.setup_and_check(value):
            editor = TextEditor(value, key, readonly=readonly, parent=parent)
            self.create_dialog(
                editor,
                dict(model=index.model(), editor=editor, key=key, readonly=readonly),
            )
        return None
    # QLineEdit for an individual value (int, float, short string, etc)
    elif is_editable_type(value) and not object_explorer:
        if readonly:
            self.sig_editor_shown.emit()
            return None
        else:
            editor = QLineEdit(parent=parent)
            editor.setFont(get_font(font_size_delta=DEFAULT_SMALL_DELTA))
            editor.setAlignment(Qt.AlignLeft)
            # This is making Spyder crash because the QLineEdit that it's
            # been modified is removed and a new one is created after
            # evaluation. So the object on which this method is trying to
            # act doesn't exist anymore.
            # editor.returnPressed.connect(self.commitAndCloseEditor)
            self.sig_editor_shown.emit()
            return editor
    # ObjectExplorer for an arbitrary Python object
    else:
        show_callable_attributes = index.model().show_callable_attributes
        show_special_attributes = index.model().show_special_attributes
        dataframe_format = index.model().dataframe_format

        if show_callable_attributes is None:
            show_callable_attributes = False
        if show_special_attributes is None:
            show_special_attributes = False

        from spyder.plugins.variableexplorer.widgets.objectexplorer import (
            ObjectExplorer,
        )

        editor = ObjectExplorer(
            value,
            name=key,
            parent=parent,
            show_callable_attributes=show_callable_attributes,
            show_special_attributes=show_special_attributes,
            dataframe_format=dataframe_format,
            readonly=readonly,
        )
        editor.sig_option_changed.connect(self.change_option)
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None


# Traceback (AttributeError)
File "D:\Anaconda\lib\site-packages\spyder\plugins\variableexplorer\widgets\collectionsdelegate.py", line 201, in createEditor
value.time()
AttributeError: 'datetime.date' object has no attribute 'time'

# Fixed code
def createEditor(self, parent, option, index, object_explorer=False):
    """Overriding method createEditor"""
    val_type = index.sibling(index.row(), 1).data()
    self.sig_open_editor.emit()
    if index.column() < 3:
        return None
    if self.show_warning(index):
        answer = QMessageBox.warning(
            self.parent(),
            _("Warning"),
            _("Opening this variable can be slow\n\nDo you want to continue anyway?"),
            QMessageBox.Yes | QMessageBox.No,
        )
        if answer == QMessageBox.No:
            return None
    try:
        value = self.get_value(index)
        if value is None:
            return None
    except ImportError as msg:
        self.sig_editor_shown.emit()
        module = str(msg).split("'")[1]
        if module in ["pandas", "numpy"]:
            if module == "numpy":
                val_type = "array"
            else:
                val_type = "dataframe, series"
            QMessageBox.critical(
                self.parent(),
                _("Error"),
                _(
                    "Spyder is unable to show the {val_type} or object "
                    "you're trying to view because <tt>{module}</tt> was "
                    "not installed alongside Spyder. Please install "
                    "this package in your Spyder environment."
                    "<br>"
                ).format(val_type=val_type, module=module),
            )
            return
        else:
            QMessageBox.critical(
                self.parent(),
                _("Error"),
                _(
                    "Spyder is unable to show the variable you're "
                    "trying to view because the module "
                    "<tt>{module}</tt> was not found in your  "
                    "Spyder environment. Please install "
                    "this package in your Spyder environment."
                    "<br>"
                ).format(module=module),
            )
            return
    except Exception as msg:
        QMessageBox.critical(
            self.parent(),
            _("Error"),
            _(
                "Spyder was unable to retrieve the value of "
                "this variable from the console.<br><br>"
                "The error message was:<br>"
                "%s"
            )
            % to_text_string(msg),
        )
        return

    key = index.model().get_key(index)
    readonly = (
        isinstance(value, (tuple, set))
        or self.parent().readonly
        or not is_known_type(value)
    )
    # CollectionsEditor for a list, tuple, dict, etc.
    if isinstance(value, (list, set, tuple, dict)) and not object_explorer:
        from spyder.plugins.variableexplorer.widgets.collectionseditor import (
            CollectionsEditor,
        )

        editor = CollectionsEditor(parent=parent)
        editor.setup(value, key, icon=self.parent().windowIcon(), readonly=readonly)
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None
    # ArrayEditor for a Numpy array
    elif (
        isinstance(value, (ndarray, MaskedArray))
        and ndarray is not FakeObject
        and not object_explorer
    ):
        editor = ArrayEditor(parent=parent)
        if not editor.setup_and_check(value, title=key, readonly=readonly):
            return
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None
    # ArrayEditor for an images
    elif (
        isinstance(value, Image)
        and ndarray is not FakeObject
        and Image is not FakeObject
        and not object_explorer
    ):
        arr = array(value)
        editor = ArrayEditor(parent=parent)
        if not editor.setup_and_check(arr, title=key, readonly=readonly):
            return
        conv_func = lambda arr: Image.fromarray(arr, mode=value.mode)
        self.create_dialog(
            editor,
            dict(
                model=index.model(),
                editor=editor,
                key=key,
                readonly=readonly,
                conv=conv_func,
            ),
        )
        return None
    # DataFrameEditor for a pandas dataframe, series or index
    elif (
        isinstance(value, (DataFrame, Index, Series))
        and DataFrame is not FakeObject
        and not object_explorer
    ):
        editor = DataFrameEditor(parent=parent)
        if not editor.setup_and_check(value, title=key):
            return
        editor.dataModel.set_format(index.model().dataframe_format)
        editor.sig_option_changed.connect(self.change_option)
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None
    # QDateEdit and QDateTimeEdit for a dates or datetime respectively
    elif isinstance(value, datetime.date) and not object_explorer:
        if readonly:
            self.sig_editor_shown.emit()
            return None
        else:
            if isinstance(value, datetime.datetime):
                editor = QDateTimeEdit(value, parent=parent)
                # Needed to handle NaT values
                # See spyder-ide/spyder#8329
                try:
                    value.time()
                except ValueError:
                    self.sig_editor_shown.emit()
                    return None
            else:
                editor = QDateEdit(value, parent=parent)
            editor.setCalendarPopup(True)
            editor.setFont(get_font(font_size_delta=DEFAULT_SMALL_DELTA))
            self.sig_editor_shown.emit()
            return editor
    # TextEditor for a long string
    elif is_text_string(value) and len(value) > 40 and not object_explorer:
        te = TextEditor(None, parent=parent)
        if te.setup_and_check(value):
            editor = TextEditor(value, key, readonly=readonly, parent=parent)
            self.create_dialog(
                editor,
                dict(model=index.model(), editor=editor, key=key, readonly=readonly),
            )
        return None
    # QLineEdit for an individual value (int, float, short string, etc)
    elif is_editable_type(value) and not object_explorer:
        if readonly:
            self.sig_editor_shown.emit()
            return None
        else:
            editor = QLineEdit(parent=parent)
            editor.setFont(get_font(font_size_delta=DEFAULT_SMALL_DELTA))
            editor.setAlignment(Qt.AlignLeft)
            # This is making Spyder crash because the QLineEdit that it's
            # been modified is removed and a new one is created after
            # evaluation. So the object on which this method is trying to
            # act doesn't exist anymore.
            # editor.returnPressed.connect(self.commitAndCloseEditor)
            self.sig_editor_shown.emit()
            return editor
    # ObjectExplorer for an arbitrary Python object
    else:
        show_callable_attributes = index.model().show_callable_attributes
        show_special_attributes = index.model().show_special_attributes
        dataframe_format = index.model().dataframe_format

        if show_callable_attributes is None:
            show_callable_attributes = False
        if show_special_attributes is None:
            show_special_attributes = False

        from spyder.plugins.variableexplorer.widgets.objectexplorer import (
            ObjectExplorer,
        )

        editor = ObjectExplorer(
            value,
            name=key,
            parent=parent,
            show_callable_attributes=show_callable_attributes,
            show_special_attributes=show_special_attributes,
            dataframe_format=dataframe_format,
            readonly=readonly,
        )
        editor.sig_option_changed.connect(self.change_option)
        self.create_dialog(
            editor, dict(model=index.model(), editor=editor, key=key, readonly=readonly)
        )
        return None