def appendClipboard(path):
    '''将内容复制到剪贴板'''
    r = Tk()
    r.withdraw()
    r.clipboard_clear()
    r.clipboard_append(path)
    r.update()
    r.destroy()

def getClipboard():
    '''返回剪贴板上的内容'''
    r = Tk()
    r.withdraw()
    tmp = r.clipboard_get()
    r.destroy()
    return tmp

filepath = 'C:\\Users\\xxx\\Downloads\\2023年度预算.xxx'
appendClipboard(filepath)
pyperclip.copy(getClipboard())
time.sleep(3)
# 模拟按下Ctrl+V粘贴
pyautogui.hotkey('ctrl', 'v')