title: python convert plain text to mathml
body: <p>I have a string "x1/4 + y3/8"</p>
  
  <p>I want its mathml value similar to {x}\frac{{{1}}}{{{4}}}%2B{y}\frac{{{3}}}{{{8}}}</p>
  
  <p>I am trying to use following codes:</p>
  
  <ul>
  <li>latex("x1/4 + y3/8") or latex(sympy.simpify("x1/4 + y3/8")): Response to this is x not defined</li>
  <li>If run latex("1/4 + 3/8") or latex(sympy.simpify("1/4 + 3/8")): Response to this is \frac{{{1/3}}}</li>
  </ul>
  
  <p>I need to pass this to separate server that converts the above to an image.</p>
  
  <p>Plese help</p>