为什么matplotlib动画只能在交互式会话中起作用?

问题描述

如果我使用代码创建文件test.py

If I create a file test.py with the code

import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation

if __name__ == '__main__':
    fig = plt.figure()
    title = fig.suptitle("Test _")

    def anim(i):
        title.set_text("Test %d" % i)
        plt.plot([0,1], [0,1])

    FuncAnimation(fig, anim)
    plt.show()

并尝试使用python test.py在命令行中运行它，我得到一个空白屏幕，标题为Test _，没有任何轴.

and try to run it in my command line, using python test.py, I get an empty screen with the title Test _ and without any axes.

使用python -i test.py运行时也是如此，但是如果我现在在交互式会话中输入相同的代码

The same is true when running with python -i test.py, but if I now enter the same code in the interactive session

>>> fig = plt.figure()
>>> title = fig.suptitle("Test _")
>>> FuncAnimation(fig, anim)
>>> plt.show()

一切正常.

我已经研究了很久了，但似乎没有发现任何与此相关的问题.我在OS X的python 3.5.2中使用matplotlib 2.0.0.

I have been looking at this for so long now and I don't seem to find any issues or questions that are related to this. I am using matplotlib 2.0.0 in python 3.5.2 on OS X.

这是(已知)错误吗?任何有想法为什么会发生这种情况或如何解决的人?

Is this a (known) bug? Anyone with ideas why this might be happening or how this could be resolved?

推荐答案

来自动画文档:"[..]保留对实例对象的引用至关重要."

From the animation documentation: "[..] it is critical to keep a reference to the instance object."

因此，您需要通过将FuncAnimation实例分配给变量来使其保持活动状态.

So you need to keep the FuncAnimation instance alive by assigning it to a variable.

import matplotlib.pyplot as plt
from matplotlib.animation import FuncAnimation

if __name__ == '__main__':
    fig = plt.figure()
    title = fig.suptitle("Test _")

    def anim(i):
        title.set_text("Test %d" % i)
        plt.plot([0,1], [0,1])

    ani = FuncAnimation(fig, anim)
    plt.show()

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关于Animation是否应在内部存储的问题，有正在进行的讨论.

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There is an ongoing discussion about whether the Animation should be stored internally or not.

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