When we create a window, by default the window size is resizable although, we can use setFixedSize() method to set the fixed size of the window but if we want to set only fix length of height or width only we cant use this method. We want to set one length fixed and other be variable in order to do so we have to use setFixedWidth() method to set fix length of width and setFizedHeight() method to set fix length of height.
Syntax :
self.setFixedWidth(width) self.setFixedHeight(height)Argument : Both take integer as argument. Action performed: setFixedWidth() sets the constant width. setFixedHeight() sets the constant height.
Code for fixed width –
Python3
# importing the required librariesfrom PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *import sysclass Window(QMainWindow): def __init__(self): super().__init__() # set the title self.setWindowTitle("Python") width = 500 # setting the fixed width of window self.setFixedWidth(width) # creating a label widget self.label_1 = QLabel("Fixed width", self) # moving position self.label_1.move(0, 0) # setting up the border self.label_1.setStyleSheet("border :3px solid black;") # resizing label self.label_1.resize(120, 80) # show all the widgets self.show()# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output : 
Code for fixed height –
Python3
# importing the required librariesfrom PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *import sysclass Window(QMainWindow): def __init__(self): super().__init__() # set the title self.setWindowTitle("Python") height = 400 # setting the fixed height of window self.setFixedHeight(height) # creating a label widget self.label_1 = QLabel("Fixed height", self) # moving position self.label_1.move(0, 0) # setting up the border self.label_1.setStyleSheet("border :3px solid black;") # resizing label self.label_1.resize(120, 80) # show all the widgets self.show()# create pyqt5 appApp = QApplication(sys.argv)# create the instance of our Windowwindow = Window()# start the appsys.exit(App.exec()) |
Output : 
