UserWarning: Matplotlib is currently using agg, which is a non-GUI backend,

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使用Pycharm过程中想要用matplotlib模块画图，结果plt.show()怎么都没有图片显示，还出现警告

UserWarning: Matplotlib is currently using agg, which is a non-GUI backend,

查了好多都不好用，找到一种可行的方法，在终端输入下面命令

sudo apt-get install tcl-dev tk-dev python-tk python3-tk

 代码中这么些

import tkinter
import matplotlib
matplotlib.use('TkAgg')
import matplotlib.pyplot as plt
import numpy as npx = np.linspace(-2,2,100)
y1 = 3*x + 4
y2 = x**2plt.plot(x,y1)
plt.plot(x,y2)plt.show()

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