python opencv cv2.namedWindow(winname, flags=None) （命名）创建窗口 cv::WindowFlags

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def namedWindow(winname, flags=None): # real signature unknown; restored from __doc__
    """
    namedWindow(winname[, flags]) -> None
    .   @brief Creates a window. 创建一个窗口。
    .   
    .   The function namedWindow creates a window that can be used as a placeholder for images and
    .   trackbars. Created windows are referred to by their names.
    
    · 	名为Window的函数创建一个可用作图像和轨迹栏的占位符的窗口。 创建的窗口由其名称引用。
    .   
    .   If a window with the same name already exists, the function does nothing.
    
    · 	如果已经存在具有相同名称的窗口，则该功能不执行任何操作。
    .   
    .   You can call cv::destroyWindow or cv::destroyAllWindows to close the window and de-allocate any associated
    .   memory usage. For a simple program, you do not really have to call these functions because all the
    .   resources and windows of the application are closed automatically by the operating system upon exit.
    
    ·	您可以调用cv :: destroyWindow或cv :: destroyAllWindows关闭窗口并取消分配任何关联的内存使用情况。 对于简单的程序，您实际上不必调用这些函数，因为在退出时，操作系统会自动关闭应用程序的所有资源和窗口。
    .   
    .   @note
    .   
    .   Qt backend supports additional flags Qt后端支持其他标志:
    .   -   **WINDOW_NORMAL or WINDOW_AUTOSIZE:** WINDOW_NORMAL enables you to resize the
    .   window, whereas WINDOW_AUTOSIZE adjusts automatically the window size to fit the
    .   displayed image (see imshow ), and you cannot change the window size manually.
    
    ·	WINDOW_NORMAL使您能够调整窗口大小，而WINDOW_AUTOSIZE会自动调整窗口大小以适合显示的图像（请参见imshow），并且您不能手动更改窗口大小。
    
    .   -   **WINDOW_FREERATIO or WINDOW_KEEPRATIO:** WINDOW_FREERATIO adjusts the image
    .   with no respect to its ratio, whereas WINDOW_KEEPRATIO keeps the image ratio.

	·	WINDOW_FREERATIO调整图像时不考虑其比例，而WINDOW_KEEPRATIO则保留图像比例。
	
    .   -   **WINDOW_GUI_NORMAL or WINDOW_GUI_EXPANDED:** WINDOW_GUI_NORMAL is the old way to draw the window
    .   without statusbar and toolbar, whereas WINDOW_GUI_EXPANDED is a new enhanced GUI.

	·	WINDOW_GUI_NORMAL是绘制没有状态栏和工具栏的窗口的旧方法，而WINDOW_GUI_EXPANDED是新的增强型GUI。
	
    .   By default, flags == WINDOW_AUTOSIZE | WINDOW_KEEPRATIO | WINDOW_GUI_EXPANDED

	·	默认情况下，标志== WINDOW_AUTOSIZE | WINDOW_KEEPRATIO | WINDOW_GUI_EXPANDED
    .   
    .   @param winname Name of the window in the window caption that may be used as a window identifier. 
    	窗口标题中可以用作窗口标识符的窗口名称。
    	
    .   @param flags Flags of the window. The supported flags are: (cv::WindowFlags)
    	窗口的标志。 支持的标志是：（cv :: WindowFlags）
    """
    pass

官网：cv :: WindowFlags

一般不用设置flag，默认是flags == WINDOW_AUTOSIZE | WINDOW_KEEPRATIO | WINDOW_GUI_EXPANDED，上面有写。