JSAnimationのAttributeError：”: 'HTMLWriter' object has no attribute '_temp_names'”を解決したい

Question

前提・実現したいこと

Windows10にanaconda3をインストールし、Jupter Notebook6.0.3で実行しています。

ここに質問の内容を詳しく書いてください。
（例）PHP(CakePHP)で●●なシステムを作っています。
JSAnimationの機能を実装中に、
"AttributeError：'HTMLWriter' object has no attribute '_temp_names'”エラーが発生しています。

発生している問題・エラーメッセージ

---

AttributeError Traceback (most recent call last)
<ipython-input-7-135fd70ab5ea> in <module>
1 # main
2 cartpole_env = Environment()
----> 3 cartpole_env.run()

<ipython-input-6-d95a468157b1> in run(self)
54
55 if is_episode_final is True: # 最終試行では動画を保存と描画
---> 56 display_frames_as_gif(frames)
57 break
58

<ipython-input-2-d7995b48f897> in display_frames_as_gif(frames)
23
24 anim.save('movie_cartpole.mp4') # 動画のファイル名と保存です
---> 25 display(display_animation(anim, default_mode='loop'))
26

~\anaconda3\lib\site-packages\JSAnimation\IPython_display.py in display_animation(anim, **kwargs)
84 """Display the animation with an IPython HTML object"""
85 from IPython.display import HTML
---> 86 return HTML(anim_to_html(anim, **kwargs))
87
88

~\anaconda3\lib\site-packages\JSAnimation\IPython_display.py in anim_to_html(anim, fps, embed_frames, default_mode)
72 #with tempfile.NamedTemporaryFile(suffix='.html') as f:
73 with _NameOnlyTemporaryFile(suffix='.html') as f:
---> 74 anim.save(f.name, writer=HTMLWriter(fps=fps,
75 embed_frames=embed_frames,
76 default_mode=default_mode))

~\anaconda3\lib\site-packages\matplotlib\animation.py in save(self, filename, writer, fps, dpi, codec, bitrate, extra_args, metadata, extra_anim, savefig_kwargs, progress_callback)
1150 progress_callback(frame_number, total_frames)
1151 frame_number += 1
-> 1152 writer.grab_frame(**savefig_kwargs)
1153
1154 # Reconnect signal for first draw if necessary

~\anaconda3\lib\contextlib.py in exit(self, type, value, traceback)
118 if type is None:
119 try:
--> 120 next(self.gen)
121 except StopIteration:
122 return False

~\anaconda3\lib\site-packages\matplotlib\animation.py in saving(self, fig, outfile, dpi, *args, **kwargs)
230 yield self
231 finally:
--> 232 self.finish()
233
234

~\anaconda3\lib\site-packages\matplotlib\animation.py in finish(self)
526 # Call run here now that all frame grabbing is done. All temp files
527 # are available to be assembled.
--> 528 self._run()
529 MovieWriter.finish(self) # Will call clean-up
530

~\anaconda3\lib\site-packages\JSAnimation\html_writer.py in _run(self)
321 of.write(JS_INCLUDE)
322 of.write(DISPLAY_TEMPLATE.format(id=self.new_id(),
--> 323 Nframes=len(self._temp_names),
324 fill_frames=fill_frames,
325 interval=interval,

AttributeError: 'HTMLWriter' object has no attribute '_temp_names'

該当のソースコード

Python3.7

試したこと

ここに問題に対して試したことを記載してください。

補足情報（FW/ツールのバージョンなど）

ここにより詳細な情報を記載してください。

Answer 1

Solution 1

The first solution is a hack. You just need to make JSAnimation package compatible with the newer versions of matplotlib. And it's much easier than you might expect.

Find the JSAnimation package in your Anaconda installation. For the case of the base environment it might be:

C:\ProgramData\Anaconda3\Lib\site-packages\JSAnimation

For other environments it will be something like:

C:\ProgramData\Anaconda3\envs\your_env_name\Lib\site-packages\JSAnimation

Open html_writer.py file with Notepad++ or any other text editor, but not with PyCharm, as it will not allow you to modify a library file.

The only things you need to change are:

• Change self._temp_names to self._temp_paths.

• Change return ('', '') to return (''.encode('utf-8'), ''.encode('utf-8')) to return a tuple of byte arrays instead of strings.

Save the file (you will need admin privileges), run the Jupyter. It should work now. It worked for me.

For convenience here's code of the _run method in html_writer.py after changes:

def _run(self):
	# make a ducktyped subprocess standin
	# this is called by the MovieWriter base class, but not used here.
	class ProcessStandin(object):
		returncode = 0
		def communicate(self):
			return (''.encode('utf-8'), ''.encode('utf-8'))
	self._proc = ProcessStandin()
	# save the frames to an html file
	if self.embed_frames:
		fill_frames = _embedded_frames(self._saved_frames,
									   self.frame_format)
	else:
		# temp names is filled by FileMovieWriter
		fill_frames = _included_frames(self._temp_paths,
									   self.frame_format)
	mode_dict = dict(once_checked='',
					 loop_checked='',
					 reflect_checked='')
	mode_dict[self.default_mode + '_checked'] = 'checked'
	interval = int(1000. / self.fps)
	with open(self.outfile, 'w') as of:
		of.write(JS_INCLUDE)
		of.write(DISPLAY_TEMPLATE.format(id=self.new_id(),
										 Nframes=len(self._temp_paths),
										 fill_frames=fill_frames,
										 interval=interval,
										 icons=_Icons(),
										 **mode_dict))

Solution 2

This is a cleaner solution. As JSAnimation was merged into newer matplotlib it is better to use the integrated version. The solution is as follows:

1. Open pong_utils.py.

2. Find animate_frames method.

3. Just before this method add:

def display_animation(anim):
    plt.close(anim._fig)
    return HTML(anim.to_jshtml())

1. Change

display(display_animation(fanim, default_mode='once'))

to

display(display_animation(fanim))

1. You can remove the import:

from JSAnimation.IPython_display import display_animation

That's it.