matplotlib库的backend在哪设置

matplotlib库的backend可以在代码中设置，也可以在matplotlibrc配置文件中设置。

在代码中设置：

import matplotlib
matplotlib.use('backend_name')

其中，`backend_name`可以替换为不同的backend名称，比如`TkAgg`、`Qt5Agg`、`Agg`等。

在matplotlibrc配置文件中设置：

可以通过修改matplotlibrc配置文件来设置默认的backend。该文件的位置可以通过以下代码查询：

import matplotlib
print(matplotlib.matplotlib_fname())

然后，在该文件中找到`backend`这一行，将其修改为需要的backend名称，保存即可。

相关问题

E:\visualization\analysis\1.py:80: MatplotlibDeprecationWarning: Support for FigureCanvases without a required_interactive_framework attribute was deprecated in Matplotlib 3.6 and will be removed two minor releases later. plt.show() C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 21508 (\N{CJK UNIFIED IDEOGRAPH-5404}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 20010 (\N{CJK UNIFIED IDEOGRAPH-4E2A}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 26376 (\N{CJK UNIFIED IDEOGRAPH-6708}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 20221 (\N{CJK UNIFIED IDEOGRAPH-4EFD}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 30340 (\N{CJK UNIFIED IDEOGRAPH-7684}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 38144 (\N{CJK UNIFIED IDEOGRAPH-9500}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 21806 (\N{CJK UNIFIED IDEOGRAPH-552E}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 24773 (\N{CJK UNIFIED IDEOGRAPH-60C5}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 20917 (\N{CJK UNIFIED IDEOGRAPH-51B5}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 36135 (\N{CJK UNIFIED IDEOGRAPH-8D27}) missing from current font. FigureCanvasAgg.draw(self) C:\Program Files\JetBrains\PyCharm 2021.3\plugins\python\helpers\pycharm_matplotlib_backend\backend_interagg.py:68: UserWarning: Glyph 21697 (\N{CJK UNIFIED IDEOGRAPH-54C1}) missing from current font. FigureCanvasAgg.draw(self) Process finished with exit code 0

这是一些Matplotlib的警告信息。其中第一条警告表示，Matplotlib 3.6版本开始不再支持没有“required_interactive_framework”属性的FigureCanvases，这个属性用于指定绘图所需的交互式框架。如果你的代码中使用了这样的FigureCanvas，建议更新Matplotlib版本或修改代码以使用最新的FigureCanvas。

其他的警告则是指出当前字体中缺少一些中文字符，这可能会影响绘图结果的显示效果。可以通过更换字体或安装支持中文字符的字体来解决这个问题。

这些警告信息并不会影响代码的运行，只是提醒你可能需要注意一些绘图的细节问题。建议在代码中加入以下语句来禁止警告的输出：

import warnings

warnings.filterwarnings("ignore")

matplotlib的backend是做什么用的

Matplotlib的backend是用于控制Matplotlib图形输出的后端引擎。它提供了一种将绘图显示在不同设备上的方法，如屏幕、文件、图形用户界面等。不同的backend可以将Matplotlib图形输出为各种格式，例如PNG、PDF、SVG等。此外，backend还提供了与特定设备交互的功能，例如在交互式窗口中缩放和平移图形，或在打印时调整图形大小和分辨率等。Matplotlib支持多个backend，包括基于GUI的backend（如Tkinter、Qt、wxWidgets等）和基于图像库的backend（如Agg、Cairo、GTK等）。