因为要仿QQ聊天界面需要用到圆形图片来做头像

from PyQt5.QtWidgets import QWidget, QApplication
from PyQt5.QtCore import Qt, QSize
from PyQt5.QtGui import QPixmap, QPainter, QBrush
import requests
import sys


class My_circle_image(QWidget):
    """
    从本地文件或URL设置圆形图片
    """

    def __init__(self, url: str, size: int, mode: str = "local", parent=None):
        super().__init__(parent)
        self.resize(size, size)
        if mode == "local":
            self.img = QPixmap(url)
        else:
            self.img = QPixmap()
            img_data = requests.get(url).content
            self.img.loadFromData(img_data)
        self.img = self.img.scaled(
            QSize(size, size), Qt.KeepAspectRatio, Qt.SmoothTransformation
        )
        self.update()

    def paintEvent(self, event):
        painter = QPainter(self)
        painter.setRenderHint(QPainter.Antialiasing, True)
        painter.setPen(Qt.NoPen)
        painter.setBrush(QBrush(self.img))
        painter.drawRoundedRect(self.rect(), self.width() / 2, self.height() / 2)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = QWidget()
    widget = My_circle_image(
        r"https://gimg2.baidu.com/image_search/src=http%3A%2F%2Fimg.wxcha.com%2Ffile%2F201812%2F22%2F580277dd05.jpg&refer=http%3A%2F%2Fimg.wxcha.com&app=2002&size=f9999,10000&q=a80&n=0&g=0n&fmt=jpeg?sec=1630665493&t=5bb0a47c1b77c08442a79e8ab68248d7",
        80,
        "remote",
        window,
    )
    window.show()
    sys.exit(app.exec_())

结果: