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对应路径上要有web.ico图标哈

代码:

import sys

from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QMainWindow


class IconForm(QMainWindow):
    def __init__(self):
        super(IconForm, self).__init__()
        self.initUI()
    def initUI(self):
        # 设置定位和左上角坐标
        self.setGeometry(300,300,250,250)
        # 设置窗口标题
        self.setWindowTitle('设置窗体图标')
        # 设置窗口图标
        self.setWindowIcon(QIcon('../web.ico'))


if __name__ == '__main__':

    app = QApplication(sys.argv)
    # 设置应用图标
    # app.setWindowIcon(QIcon('../web.ico'))
    w = IconForm()
    w.show()
    sys.exit(app.exec_())