[matplotlib] How to convert Chinese into Song typeface-English into New Roman typeface when drawing pictures

Some commonly used methods have been introduced on the Internet, and I have been tinkering with them for a long time, but they have not been successful. Finally, found a way to solve this problem.
Reference link: https://zhuanlan.zhihu.com/p/118601703, thanks for the article! Worship~

import matplotlib
import matplotlib.pyplot as plt
from matplotlib import rcParams

matplotlib.use("pgf")
pgf_config = {
    
    
    "font.family":'serif',
    "font.size": 7.5,
    "pgf.rcfonts": False,
    "text.usetex": True,
    "pgf.preamble": [
        r"\usepackage{unicode-math}",
        r"\setmainfont{Times New Roman}",
        r"\usepackage{xeCJK}",
        r"\setCJKmainfont{SimSun}",
    ],
}
rcParams.update(pgf_config)

x = [1,2,3,4,5]
y = x

plt.figure()
# 坐标轴的刻度设置向内(in)或向外(out)
plt.rcParams['xtick.direction'] = 'in'
plt.rcParams['ytick.direction'] = 'in'
# 画图
plt.plot(x, y, '-o')
# 设置背景网格线为虚线
plt.grid(linestyle="--") 
# 设置坐标轴标签                  
plt.xlabel("时间/s",fontsize=7.5)
plt.ylabel("角度/(°)",fontsize=7.5)
# 显示图像
plt.savefig('./图6-b.png',dpi=600)

Precautions:

1. When running the code for the first time, it will install something similar to a plug-in. I didn’t pay attention to see what it is, and installed it directly.
2. It seems that the file can only be saved in png format, tried jpg format without success.