import sys
from PyQt5 import QtWidgets, QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
class picture(QWidget):
  def __init__(self):
    super(picture, self).__init__()

    self.resize(600, 400)
    self.setWindowTitle("label显示图片")

    self.label = QLabel(self)
    self.label.setText("  显示图片")
    self.label.setFixedSize(300, 200)
    self.label.move(160, 160)

    self.label.setStyleSheet("QLabel{background:white;}"
                 "QLabel{color:rgb(300,300,300,120);font-size:10px;font-weight:bold;font-family:宋体;}"
                 )

    btn = QPushButton(self)
    btn.setText("打开图片")
    btn.move(10, 30)
    btn.clicked.connect(self.openimage)
  def openimage(self):
    imgName, imgType = QFileDialog.getOpenFileName(self, "打开图片", "", "*.jpg;;*.png;;All Files(*)")
    jpg = QtGui.QPixmap(imgName).scaled(self.label.width(), self.label.height())
    self.label.setPixmap(jpg)


if __name__ == "__main__":
  app = QtWidgets.QApplication(sys.argv)
  my = picture()
  my.show()
  sys.exit(app.exec_())