title: how to swap all occurrences of char1 and char2 in a string in python
body: <p>Let's say that I have this string</p>
  <pre><code>&quot;I am very good at coding&quot; 
  </code></pre>
  <p>and I want to replace all occurrences of the char &quot;o&quot; with &quot;a&quot; while simultaneously replacing every &quot;a&quot; with &quot;o&quot; so that I get</p>
  <pre><code>&quot;I om very gaad ot cading&quot; 
  </code></pre>
  <p>everything I found on Google doesn't really work for me btw, it's a very long string</p>