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Bokeh グラフ再利用時のRuntimeError:Models must be ...に対応する

Last updated at Posted at 2022-07-17

Bokehで一度描画したグラフを、違うレイアウトで再利用しようとするとRuntimeError: Models must be owned by only a single document, ... というエラーがでます。

from bokeh.plotting import figure, show
from bokeh.layouts import gridplot

p = figure()
p.scatter([1, 2, 3], [4, 5, 6])

show(p)

show(gridplot([[p]]))  # ここでエラー

これは一度showしたところで、グラフにIDがつくためのようです。
このエラーを回避するためには、IDをリセットする必要があります。

from bokeh.plotting import figure, show
from bokeh.layouts import gridplot
from bokeh.models import Model

p = figure()
p.scatter([1, 2, 3], [4, 5, 6])

show(p)

# p内部のModel型の要素を選択して、IDをリセットする
for model in p.select(Model):
    prev_doc = model.document
    model._document = None
    if prev_doc:
        prev_doc.remove_root(model)

show(gridplot([[p]]))

日本語ではあまり情報が探せなかったので、備忘録として書いておきました。

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