TypeError: object NoneType can't be used in 'await' expression

pip install PyQt5 Pillow openai

import sys
from PyQt5.QtWidgets import (
    QApplication, QWidget, QPushButton,
    QVBoxLayout, QTextBrowser, QLabel
)
from PyQt5.QtGui import QPixmap, QGuiApplication
from PyQt5.QtCore import Qt, QRect
from openai import OpenAI
import base64

class ScreenCapture(QWidget):
    """一個簡單的截圖區(qū)域選擇工具"""
    def __init__(self):
        super().__init__()
        self.begin = None
        self.end = None
        self.setWindowOpacity(0.3)
        self.setWindowState(Qt.WindowFullScreen)
        self.setWindowFlag(Qt.FramelessWindowHint)

    def paintEvent(self, event):
        from PyQt5.QtGui import QPainter, QPen

        qp = QPainter(self)
        qp.setPen(QPen(Qt.red, 2))
        qp.drawRect(QRect(self.begin, self.end))

    def mousePressEvent(self, event):
        self.begin = event.pos()
        self.end = self.begin
        self.update()

    def mouseMoveEvent(self, event):
        self.end = event.pos()
        self.update()

    def mouseReleaseEvent(self, event):
        self.close()

    def get_rect(self):
        return QRect(self.begin, self.end).normalized()


class App(QWidget):
    def __init__(self):
        super().__init__()
        self.client = OpenAI(api_key="你的API Key")

        self.setWindowTitle("AI 截圖解答 Demo")
        self.resize(600, 500)

        layout = QVBoxLayout()

        self.btn = QPushButton("截圖并解答")
        self.btn.clicked.connect(self.capture_screen)

        self.result = QTextBrowser()
        self.result.setPlaceholderText("截圖后的結(jié)果會顯示在這里…")

        layout.addWidget(self.btn)
        layout.addWidget(self.result)
        self.setLayout(layout)

    def capture_screen(self):
        # 啟動截圖工具
        cap = ScreenCapture()
        cap.show()
        cap.exec_() if hasattr(cap, "exec_") else None  # 兼容性調(diào)用

        rect = cap.get_rect()

        screenshot = QGuiApplication.primaryScreen().grabWindow(0)
        cropped = screenshot.copy(rect)

        # 保存臨時文件
        save_path = "temp.png"
        cropped.save(save_path)

        # 調(diào)用多模態(tài)模型
        with open(save_path, "rb") as f:
            img_data = base64.b64encode(f.read()).decode("utf-8")

        response = self.client.chat.completions.create(
            model="gpt-4o-mini",
            messages=[
                {"role": "system", "content": "請識別圖片內(nèi)容并進行解釋或解答"},
                {"role": "user", "content": [
                    {"type": "input_image", "image_base64": img_data}
                ]}
            ]
        )

        answer = response.choices[0].message["content"]

        self.result.setMarkdown(answer)


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = App()
    window.show()
    sys.exit(app.exec_())

self.setWindowOpacity(0.3)
self.setWindowState(Qt.WindowFullScreen)
self.setWindowFlag(Qt.FramelessWindowHint)

qp.drawRect(QRect(self.begin, self.end))

screenshot = QGuiApplication.primaryScreen().grabWindow(0)
cropped = screenshot.copy(rect)

{"type": "input_image", "image_base64": img_data}

已知函數(shù) f(x)=x2+1，求 f(3)

### 解題步驟

1. 將 x = 3 代入函數(shù)  
2. f(3) = 32 + 1 = 9 + 1 = 10

**最終答案：10**