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Bring to the front the MainWindow in Pyqt5

I am dealing with the following problem, while I am having multiple windows open, i would like to build a function linked to a button to bring to the front the Main window.
Thank you in advance.
import sys
from PyQt5 import QtGui
from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton,
QLabel)
class Window2(QMainWindow): # <===
def __init__(self):
super().__init__()
self.setWindowTitle("Window 2")
self.pushButton = QPushButton("Back to window1", self)
self.pushButton.clicked.connect(self.window1)
def window1(self): # <===
pass;
class Window(QMainWindow):
def __init__(self):
super().__init__()
self.title = "First Window"
self.top = 100
self.left = 100
self.width = 680
self.height = 500
self.pushButton = QPushButton("Go to window 2 ", self)
self.pushButton.move(275, 200)
self.label = QLabel("window 1", self)
self.label.move(285, 175)
self.setWindowTitle(self.title)
self.setGeometry(self.top, self.left, self.width, self.height)
self.pushButton.clicked.connect(self.window2) # <===
def window2(self): # <===
self.w = Window2()
self.w.show()
def main():
app = QApplication(sys.argv)
window = Window()
window.show()
#app.exec_()
exit(app.exec_())
if __name__=='__main__':
main()
Regards
I am expecting a function to call back the widget "Window"

You could emit a signal from your second window that your fist window listens for, and calls .raise_() when triggered.
Update: Added a call to activateWindow in the first windows callback. thanks #musicmante
For example:
import sys
from PyQt5 import QtGui
from PyQt5.QtCore import pyqtSignal # import signal
from PyQt5.QtWidgets import (QApplication, QMainWindow, QPushButton,
QLabel)
class Window2(QMainWindow):
unfocus = pyqtSignal() # create signal
def __init__(self, parent=None):
super().__init__(parent=parent)
self.setWindowTitle("Window 2")
self.pushButton = QPushButton("Back to window1", self)
# button press emits signal
self.pushButton.clicked.connect(self.unfocus.emit)
class Window(QMainWindow):
def __init__(self):
super().__init__()
self.title = "First Window"
self.top = 100
self.left = 100
self.width = 680
self.height = 500
self.pushButton = QPushButton("Go to window 2 ", self)
self.pushButton.move(275, 200)
self.label = QLabel("window 1", self)
self.label.move(285, 175)
self.setWindowTitle(self.title)
self.setGeometry(self.top, self.left, self.width, self.height)
self.pushButton.clicked.connect(self.window2) # <===
def window2(self): # <===
self.w = Window2()
self.w.unfocus.connect(self.bring_to_top) # listen for signal and raise_ to top focus
self.w.show()
def bring_to_top(self):
self.activateWindow()
self.raise_()
def main():
app = QApplication(sys.argv)
window = Window()
window.show()
#app.exec_()
exit(app.exec_())
if __name__=='__main__':
main()

How to create a two or more Color Custom QPushButton in PyQt5?

How to Create a Custom Button with two or More color text and as well as in With double or single underline(in a particular letter)? I tried my level best. But the Blank button (no text) only appears.
import sys
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
class MyButton(QPushButton):
def __init__ (self, mytext,parent=None):
super(MyButton,self).__init__()
self.mytext = mytext
def paintEvent(self, event):
document = QTextDocument()
document.setDocumentMargin(0)
document.setHtml(mytext)
mypixmap=QPixmap(document.size().tosize())
mypixmap.fill(Qt.transparent)
painter = QPainter(mypixmap)
document.drawContents(painter)
painter.end()
class CustomButton(QWidget):
def __init__(self):
super().__init__()
self.setWindowTitle("Grid layout Example")
self.setGeometry(100,100,400,400)
self.widget()
self.show()
def widget(self):
self.btn_sample = MyButton(QIcon("<h2><i>My sample</i> <font color=red>Button!</font></h2>"))
self.btn_sample.resize(20,20)
self.layout = QVBoxLayout()
self.layout.addWidget(self.btn_sample)
self.setLayout(self.layout)
def main():
app = QApplication(sys.argv)
mainwindow = CustomButton()
mainwindow.show()
sys.exit(app.exec_())
if __name__ == "__main__":
main()

import sys
from PyQt5.QtGui import *
from PyQt5.QtCore import *
from PyQt5.QtWidgets import *
class MyButton(QPushButton):
def __init__(self, Text, parent = None):
super(MyButton, self).__init__()
mydocument = QTextDocument()
mydocument.setDocumentMargin(0)
mydocument.setHtml(Text)
mypixmap = QPixmap(mydocument.size().toSize())
mypixmap.fill(Qt.transparent)
mypainter = QPainter(mypixmap)
mydocument.drawContents(mypainter)
mypainter.end()
myicon = QIcon(mypixmap)
self.setIcon(myicon)
self.setIconSize(mypixmap.size())
class mainwindow(QWidget):
def __init__(self , parent = None):
super(mainwindow, self).__init__()
self.setupgui()
def setupgui(self):
self.resize(800,600)
self.setWindowTitle('Custom Button With two Color Text')
newLayout = QHBoxLayout()
self.dashboard = MyButton("<h2><i>Dash Board</i> <font color=red>Qt!</font></h2>",self)
self.transcation = MyButton('<font color="red"><u>T</u></font><font color="black">ranscation</font>',self)
newLayout.addWidget(self.dashboard)
newLayout.addWidget(self.transcation)
self.setLayout(newLayout)
self.show()
def main():
app = QApplication(sys.argv)
ex = mainwindow()
sys.exit(app.exec_())
if __name__ == '__main__':
main()

Python using QGridLayout not add widget

I'm new to Qt5, I have a simple QGridLayout layout mask .
I want to create a windows with the widget resize with resize of window
this is the code
import sys
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QFileDialog ,QVBoxLayout,QGroupBox,QGridLayout
class MainWindow(QtWidgets.QMainWindow, QtWidgets.QFileDialog, QtWidgets.QLineEdit):
def __init__(self):
super().__init__()
self.title = "Calcolo Hash"
self.top = 100
self.left = 100
self.width = 800
self.height = 330
self.InitWindow()
def InitWindow(self):
self.setWindowIcon(QtGui.QIcon("icona_aprie.png"))
self.setWindowTitle(self.title)
self.setGeometry(self.top, self.left, self.width, self.height)
self.creamaschera()
self.show()
def creamaschera(self):
print ("creazione maschera")
layout = QtWidgets.QGridLayout()
self.txtcartella = QtWidgets.QLineEdit()
self.lblprova = QtWidgets.QLabel("Please enter new name:")
# self.txtcartella.setGeometry(QtCore.QRect(10, 10, 301, 20))
# self.txtcartella.setObjectName("txtcartella")
layout.addWidget(self.lblprova,0,0)
layout.addWidget(self.txtcartella,0,1)
self.setLayout(layout)
# self.horizontalGroupBox.setLayout(layout)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
w = MainWindow()
#w.show()
sys.exit(app.exec_())
but when I run the mask is empy.
I make the base with Qt5 designer and convert it to python. I want to refactor the class in a best workout.
Where is the error?

You should setLayout in a widget rather than setting it to the MainWindow since you are using the MainWindow class itself and while accessing the methods and properties of the class MainWindow you can be more specific
import sys
from PyQt5 import QtCore, QtGui
from PyQt5.QtWidgets import (QLineEdit, QMainWindow, QWidget,
QGridLayout, QLabel, QApplication)
class MainWindow(QMainWindow):
def __init__(self, *args, **kwargs):
super(MainWindow, self).__init__(*args, **kwargs)
self.title = "Calcolo Hash"
self.top = 100
self.left = 100
self.width = 800
self.height = 330
self.InitWindow()
def InitWindow(self):
self.setWindowIcon(QtGui.QIcon("icona_aprie.png"))
self.setWindowTitle(self.title)
self.setGeometry(self.top, self.left, self.width, self.height)
self.creamaschera()
def creamaschera(self):
print("creazione maschera")
Layout = QGridLayout()
self.txtcartella = QLineEdit()
self.lblprova = QLabel("Enter Your Name")
self.lblprova.setGeometry(QtCore.QRect(15, 15, 301, 20))
self.txtcartella.setObjectName("txtcartella")
Layout.addWidget(self.lblprova, 0, 0)
Layout.addWidget(self.txtcartella, 0, 1)
# Widget to setLayout in it since you are using MainWindow as an Class
widget = QWidget()
widget.setLayout(Layout)
# SetCentralWidget without this widget won't be placed
self.setCentralWidget(widget)
# self.horizontalGroupBox.setLayout(layout)
if __name__ == "__main__":
app = QApplication(sys.argv)
MainWindow = MainWindow()
MainWindow.show()
sys.exit(app.exec_())

Exit when Python gui button is clicked

I want to show the results by clicking on the button, but if I press this code, the program will end in two seconds.
And 'pursent.ui' is just a widget that hasn't been set up.
import sys
from PyQt5.QtWidgets import *
from PyQt5 import uic
form_class = uic.loadUiType("pursent.ui")[0]
class MyWindow(QMainWindow, form_class):
def __init__(self):
super().__init__()
self.setupUi(self)
self.pushButton.clicked.connect(self.btneve)
def btneve(self):
self.statusbar.showMessage((int(self.lineEdit_2.text())-int(self.lineEdit.text()))/int(self.lineEdit.text())*100)
if __name__ == "__main__":
app = QApplication(sys.argv)
myWindow = MyWindow()
myWindow.show()
app.exec_()

void QStatusBar::showMessage(const QString &message, int timeout = 0)
Hides the normal status indications and displays the given message for the specified number of milli-seconds (timeout).
import sys
from PyQt5.QtWidgets import *
#from PyQt5 import uic
#form_class = uic.loadUiType("pursent.ui")[0]
class MyWindow(QMainWindow): #, form_class):
def __init__(self):
super().__init__()
# self.setupUi(self)
centralWidget = QWidget()
self.setCentralWidget(centralWidget)
self.lineEdit = QLineEdit()
self.lineEdit_2 = QLineEdit()
self.pushButton = QPushButton('Button')
self.pushButton.clicked.connect(self.btneve)
self.statusbar = self.statusBar() # = StatusBar(self)
grid = QGridLayout(centralWidget)
grid.addWidget(self.lineEdit)
grid.addWidget(self.lineEdit_2)
grid.addWidget(self.pushButton)
def btneve(self):
self.statusbar.showMessage(str( # + str
(int(self.lineEdit_2.text())-int(self.lineEdit.text()))/int(self.lineEdit.text())*100)
)
if __name__ == "__main__":
app = QApplication(sys.argv)
myWindow = MyWindow()
myWindow.show()
app.exec_()

change label from other class in a different file

I am creating an application where I have a main window whit a label and then a docked widget that is in another file. I want to change the main windows label from a button at the docked widget. I try to import the main window file but then I can not access to the label. And I also tried to call a function in the main windows that changes the label but then the label does not change.
Here is the code:
main_window.py:
import results_window
class MainWindow(QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.define_main_windows()
self.create_dock_widgets()
def define_main_windows(self):
# Define de Main window properties
self.setMinimumSize(QSize(300, 100))
self.setWindowTitle("Python SkyLibris")
self.setWindowIcon(QtGui.QIcon("skylibris_icon.png"))
self.setStyleSheet("QMainWindow {background: 'white';}")
self.top = 50
self.left = 0
self.width = 1300
self.height = 400
self.setGeometry(self.left, self.top, self.width, self.height)
self.result = QLabel("result:")
self.setCentralWidget(self.result)
def create_dock_widgets(self):
# Create dock widgets
self.results_window = results_window.results_window()
self.resultsWindowDock = QDockWidget("Results Viewer", self)
self.resultsWindowDock.setWidget(self.results_window )
self.resultsWindowDock.setFloating(False)
self.resultsWindowDock.setVisible(True)
self.addDockWidget(Qt.LeftDockWidgetArea, self.resultsWindowDock)
if __name__ == "__main__":
app = QtWidgets.QApplication(sys.argv)
app.setStyle('Fusion')
mainWin = MainWindow()
mainWin.show()
sys.exit(app.exec_())
results_window.py:
import main_window
class results_window(QWidget):
def __init__(self):
super(results_window, self).__init__()
print("init")
self.label = QLabel()
self.value = QLineEdit()
self.bt = QPushButton("Click")
self.bt.clicked.connect(self.clickMethod)
self.main_layout = QVBoxLayout()
self.main_layout.addWidget(self.label)
self.main_layout.addWidget(self.value)
self.main_layout.addWidget(self.bt)
self.setLayout(self.main_layout)
def clickMethod(self):
print(self.value.text())
text = self.value.text()
main_window.result.setText(text)

You are using the wrong tools, for example your code has a circular import that causes your application to close since it is equivalent to a while True.
In Qt, signals and slots are used to share data asynchronously, as well as contributing to the fact that there is no coupling between classes. In your case, Results_Window must have a signal that transmits that information to the MainWindow, this signal must be emit within clickMethod.
results_window.py
from PyQt5 import QtCore, QtWidgets
class Results_Window(QtWidgets.QWidget):
resultChanged = QtCore.pyqtSignal(str)
def __init__(self):
super(Results_Window, self).__init__()
print("init")
self.label = QtWidgets.QLabel()
self.value = QtWidgets.QLineEdit()
self.bt = QtWidgets.QPushButton("Click")
self.bt.clicked.connect(self.clickMethod)
main_layout = QtWidgets.QVBoxLayout(self)
main_layout.addWidget(self.label)
main_layout.addWidget(self.value)
main_layout.addWidget(self.bt)
#QtCore.pyqtSlot()
def clickMethod(self):
text = self.value.text()
self.resultChanged.emit(text)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
app.setStyle('Fusion')
w = Results_Window()
w.show()
sys.exit(app.exec_())
main_window.py
from PyQt5 import QtCore, QtGui, QtWidgets
import results_window
class MainWindow(QtWidgets.QMainWindow):
def __init__(self):
super(MainWindow, self).__init__()
self.define_main_windows()
self.create_dock_widgets()
def define_main_windows(self):
self.setMinimumSize(QtCore.QSize(300, 100))
self.setWindowTitle("Python SkyLibris")
self.setWindowIcon(QtGui.QIcon("skylibris_icon.png"))
self.setStyleSheet("QMainWindow {background: 'white';}")
top, left, width, height = 50, 0, 1300, 400
self.setGeometry(left, top, width, height)
self.result = QtWidgets.QLabel("result:")
self.setCentralWidget(self.result)
def create_dock_widgets(self):
self.results_window = results_window.Results_Window()
self.results_window.resultChanged.connect(self.result.setText)
self.resultsWindowDock = QtWidgets.QDockWidget("Results Viewer", self)
self.resultsWindowDock.setWidget(self.results_window )
self.resultsWindowDock.setFloating(False)
self.resultsWindowDock.setVisible(True)
self.addDockWidget(QtCore.Qt.LeftDockWidgetArea, self.resultsWindowDock)
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
app.setStyle('Fusion')
mainWin = MainWindow()
mainWin.show()
sys.exit(app.exec_())

I had similar problem in PyQT5 where I was unable to access and set the local variables. After a lot of struggle I found writing to file and reading from file as the best solution. Simply write the desired output to file and access the same info from other file. Works great!