title: Transform string to f-string
body: <p>How do I transform a classic string to an f-string?</p>
  <pre><code>variable = 42
  user_input = &quot;The answer is {variable}&quot;
  print(user_input)
  </code></pre>
  <p>Output: <code>The answer is {variable}</code></p>
  <pre><code>f_user_input = # Here the operation to go from a string to an f-string
  print(f_user_input)
  </code></pre>
  <p>Desired output: <code>The answer is 42</code></p>