“用户警告:Matplotlib目前正在使用agg，这是一个非gui后端，所以不能显示图形。

我试图用pyplot绘制一个简单的图形，例如:

import matplotlib.pyplot as plt
plt.plot([1,2,3],[5,7,4])
plt.show()

但是这个图没有出现，我得到了以下消息:

UserWarning: Matplotlib is currently using agg, which is a non-GUI backend, so cannot show the figure.

我在几个地方看到必须使用以下命令更改matplotlib的配置:

import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt

我这样做了，但得到了一个错误消息，因为它找不到一个模块:

ModuleNotFoundError: No module named 'tkinter'

然后，我尝试使用pip install tkinter(在虚拟环境中)安装“tkinter”，但它没有找到它:

Collecting tkinter
  Could not find a version that satisfies the requirement tkinter (from versions: )
No matching distribution found for tkinter

我还应该提到，我是在使用虚拟环境的Pycharm Community Edition IDE上运行所有这些，并且我的操作系统是Linux/Ubuntu 18.04。

我想知道我如何解决这个问题，以便能够显示图形。

当前回答

当我在Spyder上遇到这个错误时，我从一行一行地运行我的代码，改为突出显示我的绘图代码块并一次性运行。瞧，图像出现了。

2020-05-07 02:23:42

其他回答

After upgrading lots of packages (Spyder 3 to 4, Keras and Tensorflow and lots of their dependencies), I had the same problem today! I cannot figure out what happened; but the (conda-based) virtual environment that kept using Spyder 3 did not have the problem. Although installing tkinter or changing the backend, via matplotlib.use('TkAgg) as shown above, or this nice post on how to change the backend, might well resolve the problem, I don't see these as rigid solutions. For me, uninstalling matplotlib and reinstalling it was magic and the problem was solved.