pyqt5让图片自适应QLabel大小上以及移除已显示的图片方法

import sys
from PyQt5.QtWidgets import (QWidget, QHBoxLayout, QLabel, QApplication)
from PyQt5.QtGui import QPixmap
 
 
class Example (QWidget):
 def __init__(self):
 super ().__init__ ()
 self.initUI ()
 
 def initUI(self):
 hbox = QHBoxLayout (self)
 lbl = QLabel (self)
 pixmap = QPixmap ("E:\programming\python\MineSweeper\mine.jpg") # 按指定路径找到图片，注意路径必须用双引号包围，不能用单引号
 lbl.setPixmap (pixmap) # 在label上显示图片
 lbl.setScaledContents (True) # 让图片自适应label大小
 hbox.addWidget (lbl)
 self.setLayout (hbox)
 self.move (300, 200)
 self.setWindowTitle ('Red Rock')
 self.show ()
 
 
if __name__ == '__main__':
 app = QApplication (sys.argv)
 ex = Example ()
 sys.exit (app.exec_ ())

lbl.setScaledContents (True) # 让图片自适应label大小

lbl.setPixmap(QPixmap(""))#移除label上的图片

import sys
from PyQt5.QtWidgets import (QWidget, QHBoxLayout, QLabel, QApplication)
from PyQt5.QtGui import QPixmap
 
 
class Example (QWidget):
 def __init__(self):
 super ().__init__ ()
 self.initUI ()
 
 def initUI(self):
 hbox = QHBoxLayout (self)
 lbl = QLabel (self)
 pixmap = QPixmap ("E:\programming\python\MineSweeper\mine.jpg") # 按指定路径找到图片
 lbl.setPixmap (pixmap) # 在label上显示图片
 lbl.setScaledContents (True) # 让图片自适应label大小
 lbl.setPixmap(QPixmap(""))#移除label上的图片
 hbox.addWidget (lbl)
 
 
 self.setLayout (hbox)
 self.move (300, 200)
 self.setWindowTitle ('Red Rock')
 self.show ()
 
 
if __name__ == '__main__':
 app = QApplication (sys.argv)
 ex = Example ()
 sys.exit (app.exec_ ())