如何从稀疏的SciPy矩阵中获得非零值？(How to get non-zero values from sparse SciPy matrix?)

 Pydude走在正确的轨道上但过早地停了下来。 你得到一个非常无用的错误信息，因为你使用导入为pygame的from blank import *方法导入了pygame.mouse （小m），但是它应该覆盖那个你有mouse = Mouse() 。 问题是你的缩进是错误的。 从running = True下来的所有内容都需要再次缩进，包括该行。 然后，要使main()函数运行，您需要在文件末尾包含它： 
 
if __name__ == "__main__":
    main()
 
 所以当你运行代码时发生的事情就是它跳过main（）方法（在你的代码中永远不会调用）并在缩进返回后运行这些东西，从running = True 。 当它到达mouse.display() 你还没有实际运行mouse = Mouse() ，所以它使用从pygame导入的mouse 。 该mouse没有display()方法，因此您的错误消息。 
 
 修复后，您的代码中会出现更多错误，但此更改将使您超过此错误。 下一个至少有一个更有用的错误消息，所以你应该能够弄明白。 
 
 此外，一些建议： from blank import *因为这个原因而不鼓励。 要么import pygame并且引用所有内容要好得多，例如pygame.sprite （你已经在做了......这很奇怪，你正在做两个......）或者from pygame import sprite, foo, bar, ...做from pygame import sprite, foo, bar, ...并明确列出您希望从该模块中获得的每个特定事物。 这两种方法可以防止您使未知的东西混乱您的命名空间，并且会阻止您获得您无法弄清楚的这种令人困惑的错误消息。 

Pydude was on the right track but stopped way too soon. You're getting a very un-helpful error message because pygame.mouse (with a small m) is imported when you use the from blank import * method of importing for pygame, but it SHOULD overwrite that one where you have mouse = Mouse(). The problem is your indentation is wrong. Everything from running = True down needs to be indented once more, including that line. Then, to get the main() function to run, you need to include this at the end of your file:
 
if __name__ == "__main__":
    main()
 
So what is happening when you run the code as you have it is that it skips right over the main() method (which is never called in your code) and runs the stuff after the indentation goes back, starting with running = True. When it gets to mouse.display() you haven't actually run the line mouse = Mouse() yet so it uses mouse imported from pygame. That mouse doesn't have a display() method, hence your error message.
 
You'll have more errors in your code after fixing that, but this change will get you past this one error. The next one has a more helpful error message at least, so you should be able to figure it out.
 
Also, some advice: from blank import * is discouraged for EXACTLY this reason. It's much better to either do import pygame and refer to everything as, eg, pygame.sprite (which you're already doing as well...which is odd that you're doing both...) or do from pygame import sprite, foo, bar, ... and explicitly list each specific thing you want out of that module. These two methods prevent you from having unknown stuff cluttering your namespace, and would have prevented you from getting this confusing error message you couldn't figure out.