How to read a csv file after browsing it in PyQt5 [duplicate] - python-3.x

Question

I have a block of code that opens a QFileDialog using Python3 and PyQt5:
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QFileDialog
import sys
class MCVE(QWidget):
def __init__(self):
super().__init__()
self.initialize()
def initialize(self):
self.setWindowTitle('MCVE')
self.setGeometry(50, 50, 400, 200)
btn = QPushButton('Example', self)
btn.clicked.connect(self.clicked)
self.show()
def clicked(self):
filename = QFileDialog.getOpenFileName(
self, "Open Template", "c:\\",
"Templates (*.xml);;All Files (*.*)")
print(filename)
if __name__ == '__main__':
app = QApplication(sys.argv)
ex = MCVE()
sys.exit(app.exec_())
In Python 2 using PyQt4 the print(filename) statement, after pressing the cancel button, outputs as an empty string. When I run the same code in Python 3 using PyQt5 I get:
('', '')
NOTE: The quotes are Single Quotes
Can someone explain what is going on? I couldn't find anything under the documentation between PyQt4 and PyQt5. I know that strings changed between Python 2 and Python 3, but I'm not sure those changes would cause an issue like this. Thanks!

Answer 1

The getOpenFileName function in PyQt4 returns a string that is the name of the selected file, and if none is selected then it returns an empty string.
filename = QFileDialog.getOpenFileName(self, "Open Template", "c:\\", "Templates (*.xml);;All Files (*.*)")
However in PyQt5 this returns a tuple of 2 elements where the first one is a string that has the same behavior as in PyQt4, and the second element is the filter used.
filename, filters = QFileDialog.getOpenFileName(self, "Open Template", "c:\\", "Templates (*.xml);;All Files (*.*)")
Note: The majority of documentation of PyQt5 is in Qt5, since in general the names of the methods, the inputs and the result are similar.