How to filter items in QListWidget - pyqt5

Question

I have the following QlistWidget:
self.myListWidget1 = QListWidget()
os.chdir("./Downloads")
for file in glob.glob("*.pdf"):
QListWidgetItem(file, self.myListWidget1)
self.myListWidget1.sortItems()
How can I add a QLineEdit that is able to filter items in self.myListWidget1 by partial
string?

Answer 1

The currently accepted answer by Papooch is not very good unfortunately. The reason is that it will not keep the current row event if it remains withing filter criteria. You do not want to generate a new list. You actually want to hide items which are not withing filter criteria. Do it like this:
void ItemsListWidget::filterItems(QString filter)
{
for (int row = 0; row < count(); ++row)
{
item(row)->setHidden(!item(row)->text().contains(filter, Qt::CaseInsensitive)); // you can leave out the case insensitivity if you do not want it
}
}
(it is Qt/C++ code but I am pretty sure you can easily adapt it for Python)

Answer 2

You are going to need a separate list on which you will do the filtering and then display the filtered list in the QListWidget.
The most basic example could look like this:
self.myLineEdit = QLineEdit()
self.myListWidget1 = QListWidget()
self.listOfPdfs = [] # this will hold the complete list of files
os.chdir("./Downloads")
for file in glob.glob("*.pdf"):
self.listOfPdfs.append(file) # fill the list
QListWidgetItem(file, self.myListWidget1)
# connect the signal textChanged to the filter function
self.myLineEdit.textChanged.connect(self.filterList)
def filterList(self, text):
self.myListWidget1.clear() # clear the list widget
for file on self.listOfPdfs:
if text in file: # only add the line if it passes the filter
QListWidgetItem(file, self.myListWidget1)
(note that I didn't check the validity of the code, minor modifications might be needed)