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Unable to revert mtime: /Library/Fonts。今日のpython 警告 

Last updated at Posted at 2019-07-17

matplotlibでのプロットの基本
https://qiita.com/KntKnk0328/items/5ef40d9e77308dd0d0a4

sin.py
import matplotlib.pyplot as plt
import numpy as np

# データ生成
x = np.linspace(0, 10, 100)
y1 = np.sin(x)
y2 = np.cos(x)

# プロット領域(Figure, Axes)の初期化
fig = plt.figure(figsize=(12, 8))
ax1 = fig.add_subplot(131)
ax2 = fig.add_subplot(132)
ax3 = fig.add_subplot(133)

# 棒グラフの作成
ax1.bar([1,2,3],[3,4,5])
ax2.barh([0.5,1,2.5],[0,1,2])
ax3.scatter(y1, y2)

# 水平線、垂直線を入れる
ax3.axhline(0.45)
ax3.axvline(0.65)

plt.show()

編集して実行してみる。

macOS
$ vi sin.py
$ python sin.py
Unable to revert mtime: /Library/Fonts
/Users/administrator/.pyenv/versions/anaconda3-4.3.0/lib/python3.6/site-packages/matplotlib/font_manager.py:280: UserWarning: Matplotlib is building the font cache using fc-list. This may take a moment.
  'Matplotlib is building the font cache using fc-list. '

sinpy.png

けいこくは警告。
描画にすこし時間がかかった。

画像を閉じるとプログラムが終わった。再度実行した。

macOS
$ python sin.py

今度は警告が出なかった。さいしょだけなんだ。

参考資料

python error collection

文書履歴(document history)

ver. 0.01 初稿  20190717
ver. 0.01 初稿  20230311

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