title: How to find number of times a string is repeating in particular string in python
body: <p>I want to find number of times a string present in a string in python</p>
  
  <p>i already tried</p>
  
  <pre><code>my_str = "Hello world all in the world call me tell me"
  sum(1 for x in my_str if x="ll")
  </code></pre>
  
  <p>i want its result as 4</p>