title: Any function which says if a sublist[i.e. something] exists inside a list or not?
body: <p>Is there any simple function which says if a sub-list [i.e Something or Anything] exits within a list or not ?</p>
  
  <p>For Example:
  a. Says there is a top list, i.e. top_list = []
  b. Next check if some sub-list exits or not i.e. if top_list[0] exits or not ?
     Something like, top_list is [[]]. That sub-list can be just an empty list [] or a list with some number etc..</p>
  
  <p>Just wanted to find if a sub-list exits within a list or not ? Kindly drop in your comments if you have any suggestions.</p>
  
  <p>Thanks in Advance,
  Vimo</p>