【python】有道云笔记/语雀/typora 数学公式转换

【背景】从有道云笔记迁移笔记到语雀/typora，但这几家的数学公式的代码不一样。

【实现】

• '$C_{1}$' 变成 $C_{1}$
• ```math
  \begin{array}{r}
  a_{1}^{{(2)}=g\left(\Theta_{10}}{(1)} x_{0}+\Theta_{11}^{(1)} x_{1}+\Theta_{12}^{(1)} x_{2}+\Theta_{13}^{(1)} x_{3}\right) \
  a_{2}^{{(2)}=g\left(\Theta_{20}}{(1)} x_{0}+\Theta_{21}^{(1)} x_{1}+\Theta_{22}^{(1)} x_{2}+\Theta_{23}^{(1)} x_{3}\right) \
  a_{3}^{{(2)}=g\left(\Theta_{30}}{(1)} x_{0}+\Theta_{31}^{(1)} x_{1}+\Theta_{32}^{(1)} x_{2}+\Theta_{33}^{(1)} x_{3}\right) \
  h_{\Theta}(x)=a_{1}^{{(3)}=g\left(\Theta_{10}}{(2)} a_{0}^{{(2)}+\Theta_{11}}{(2)} a_{1}^{{(2)}+\Theta_{12}}{(2)} a_{2}^{{(2)}+\Theta_{13}}{(2)} a_{3}^{(2)}\right)
  \end{array}
  ```
  变成
  $$
  \begin{array}{r}
  a_{1}<sup>{(2)}=g\left(\Theta_{10}</sup>{(1)} x_{0}+\Theta_{11}^{(1)} x_{1}+\Theta_{12}^{(1)} x_{2}+\Theta_{13}^{(1)} x_{3}\right) \
  a_{2}<sup>{(2)}=g\left(\Theta_{20}</sup>{(1)} x_{0}+\Theta_{21}^{(1)} x_{1}+\Theta_{22}^{(1)} x_{2}+\Theta_{23}^{(1)} x_{3}\right) \
  a_{3}<sup>{(2)}=g\left(\Theta_{30}</sup>{(1)} x_{0}+\Theta_{31}^{(1)} x_{1}+\Theta_{32}^{(1)} x_{2}+\Theta_{33}^{(1)} x_{3}\right) \
  h_{\Theta}(x)=a_{1}<sup>{(3)}=g\left(\Theta_{10}</sup>{(2)} a_{0}<sup>{(2)}+\Theta_{11}</sup>{(2)} a_{1}<sup>{(2)}+\Theta_{12}</sup>{(2)} a_{2}<sup>{(2)}+\Theta_{13}</sup>{(2)} a_{3}^{(2)}\right)
  \end{array}
  $$

# 有道云--->语雀/typora
import re
with open('D:\Desktop\\test.md',encoding='utf-8') as f, open('D:\Desktop\\res.md','w',encoding='utf-8') as f2:
    content = f.read()
    content = re.sub('```math([\s\S]*?)```',r'$$\1$$',content)
    content = re.sub('([`][$])|([$][`])','$',content)
    f2.write(content)