小编Ric*_*ati的帖子

我通过调用使用matplotlib动画:

plot = animation.FuncAnimation(fig, update, frames=data_gen(a), init_func=init, interval=10, blit=True)

这里,"a"是data_gen函数的初始值,如下所示:

data_gen(x)
    old_x = x
    while True:
        new_x = func(old_x)
        old_x = new_x
        yield new_x

此代码的目的是让data_gen在每次更新动画图时为new_x生成新值.

但是......这恰巧发生了:

animation.py 在FuncAnimation类的init()方法中抛出错误.

此代码中出现此问题:

elif iterable(frames):
    self._iter_gen = lambda: iter(frames)
    self.save_count = len(frames)

错误是"TypeError:类型'生成器'的对象没有len()"

看起来data_gen是可迭代的,但它没有len().

以下是FuncAnimation类中init()方法的更多代码:

    # Set up a function that creates a new iterable when needed. If nothing
    # is passed in for frames, just use itertools.count, which will just
    # keep counting from 0. A callable passed in …