Get the len of QLineEdit in PyQt5

Question

I am writing a project that comes and takes the file address(path) from the user. And when the user clicks on the next button, she enters the loading page. I encountered a problem here that when the user does not specify the address and path of the file, she enters the loading page. And I want to write to QLineEdit when the user clicks the button without specifying the file path, please specify the path or something like that.

And I feel that for this purpose the length of QlineEdit should be checked and if it is less than one, it should write the text for the user, but the problem is that there is no function that measures the length of QLineEdit values.

First, I wanted to convert QLineEdit to a string, which Python does not allow such a thing in Python.

This is Source Of Project:

from PyQt5.QtWidgets import QMainWindow, QApplication, QPushButton , QFileDialog, QWidget, QLineEdit, QStatusBar, QMenuBar
from PyQt5.QtCore import QRect, QCoreApplication, QMetaObject
from PyQt5.QtGui import QFont
import sys
import time

class Ui(QMainWindow):
    def __init__(self):
        super(Ui, self).__init__()
        MainWindow.setObjectName("MainWindow")
        MainWindow.setEnabled(True)
        MainWindow.resize(577, 287)
        self.setWindowTitle("Browse Your File")
        self.centralwidget = QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.lineEdit = QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QRect(20, 40, 541, 61))
        font = QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.lineEdit.setFont(font)
        self.lineEdit.setStyleSheet("QLineEdit {\n"
        "background: #93deed;\n"
        "border: 2px solid rgb(0 , 170 , 255);\n"
        "border-radius: 30px ;\n"
        "color: white;\n"
"}\n"
"\n"
"QLineEdit:focus {\n"
"    border: 2px solid #DA7B93;\n"
"}")
        self.lineEdit.setObjectName("lineEdit")
        self.pushButton = QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QRect(50, 160, 151, 61))
        font = QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.lineEdit.setReadOnly(True)
        self.pushButton.setFont(font)
        self.pushButton.setStyleSheet("QPushButton {\n"
"    background: #2F4454;\n"
"    border: 2px solid #2F4454;\n"
"    border-radius: 25px;\n"
"    color:white;\n"
"}\n"
"\n"
"QPushButton:hover {\n"
"    background-color: #DA7B93;\n"
"    border: 2px solid #DA7B93;\n"
"}\n"
"")
        self.pushButton.setObjectName("pushButton")
        self.nextBtn = QPushButton(self.centralwidget)
        self.nextBtn.setGeometry(QRect(350, 160, 151, 61))
        font = QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.nextBtn.setFont(font)
        self.nextBtn.setStyleSheet("QPushButton {\n"
"    background: #2F4454;\n"
"    border: 2px solid #2F4454;\n"
"    border-radius: 25px;\n"
"    color:white;\n"
"}\n"
"\n"
"QPushButton:hover {\n"
"    background-color: #DA7B93;\n"
"    border: 2px solid #DA7B93;\n"
"}\n"
"")
        self.pushButton.setObjectName("nextBtn")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QMenuBar(MainWindow)
        self.menubar.setGeometry(QRect(0, 0, 577, 26))
        self.menubar.setObjectName("menubar")
        MainWindow.setMenuBar(self.menubar)
        self.statusbar = QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QMetaObject.connectSlotsByName(MainWindow)

        self.pushButton.clicked.connect(self.Clicker)
        self.nextBtn.clicked.connect(self.Next)
        self.nextBtn.clicked.connect(MainWindow.close)
    
    def Clicker(self):
        # Open File:
        global fname 
        fname = QFileDialog.getOpenFileName(self, "Open File", "", "Video Files (*.mp4);;Video Files (*.mov);;Video Files (*.avi);;Video Files (*.mkv)")
        # Output File DIR to Screen:
        if fname:
                self.lineEdit.setText(" "+str(fname[0])) 

    def Next(self):
        global Video_Address
        lineEditNew = str(self.lineEdit)
        if (self.lineEdit) <= 1:
            self.lineEdit.setPlaceholderText("Invalid Directory...")
        else:    
            print(str(fname))
            Video_Address = str(fname[0])
            self.close()
            self.loading_screen = SplashScreen()
            self.loading_screen.show()

    def retranslateUi(self, MainWindow):
        _translate = QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("Browse Your File", "Browse Your File"))
        self.lineEdit.setPlaceholderText(_translate("MainWindow", " Directory Of Your Video..."))
        self.pushButton.setText(_translate("MainWindow", "Browse"))
        self.nextBtn.setText(_translate("MainWindow", "Next"))

This is the program environment. And with the browse button, the user can select the file. And the path of that file is written inside that QLineEdit. And by pressing the next button, if a path was entered, it will enter a loading page, and if it is not there, the text of QLineEdit will be changed to an invalid address or something like that.

In short, how to measure the length of the string entered into QLineEdit?

Answer 1

In your Next method do.

    def Next(self):
        global Video_Address
        text = self.lineEdit.text()
        if len(text) <= 1:
            self.lineEdit.setPlaceholderText("Invalid Directory...")
        ...
        ...