import pandas as pd
import numpy as np
import matplotlib.pyplot as plt

x=np.arange(10)
y=np.sin(x)

plt.figure(figsize=(10,8))

plt.plot(x,y,label=r'$\alpha_v$') #在两个$号之间输出
plt.title(r'$\alpha$')
plt.legend(fontsize=16)
plt.xlabel(r'$\theta_{se}$',fontsize=16) #下标用_来表示，如果下标或者上标有多个字符，用花括号括起来
#plt.xlabel(r'$T$',fontsize=16) #输出斜体T

import re
 
txt="亲请在2s内计算老司机的车速是多少
1678151565-1188787929+1755483937+817954137-442257056-2006451995*2113482706+790747088*888843907+1335150586-33099917="
 
expression = re.search(r'(\d+[+\-*])+(\d+)', txt).group()
result = eval(expression)
print(result)