Figures not automatically rendered in some cases

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
38/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
jupyter-notebook, python
Domain
data-visualization

Research direction

Start by reproducing the two-cell example in a fresh Jupyter kernel, comparing the inline rendering behavior with and without the style context and DateFormatter. Trace the rendering path after the first cell; done means figures created in subsequent cells are rendered normally.

Written by the indexing model from the issue text.

Description

I found that in a fresh Jupyter kernel, the following snippet prevents further figures to be rendered:

# cell 1
import matplotlib.pyplot as plt
from matplotlib.dates import DateFormatter

with plt.style.context('seaborn'):
    fig, ax = plt.subplots(figsize=(5, 5))
    ax.xaxis.set_major_formatter(DateFormatter("%H:%M"))

This figure ("cell 1") is rendered, but new figures are not rendered any more in a notebook:

# cell 2
fig, ax = plt.subplots(figsize=(5, 5))  # not rendered

The issue does not appear in any of the following case:

  • "cell 2" is run before "cell 1": all following figures are then properly rendered
  • The %matplotlib inline instruction is explicitly added, before or after "cell 1"
  • The context manager is not used (but it fails with any stylesheet)
  • The DateFormatter is not applied
Dominant language
Jupyter Notebook
Stars
31
Forks
39
No merged PRs in 30d

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