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Python check if an item is on the list

How to check whether an item exist on the list?

If then else and using the "in" operator in Python is able to check whether an item is on the list or not.

Here's a code example, it's not a complete program but a demonstration how the snippet can be used, the code can be integrated into an existing complete code.

lst = list() #list declaration in Python
  
     #if item is already on the list it will just continue and will not execute the else command           
if yitem in lst: continue  
       else:
          print(" Item 'yitem' is not present in the list, appending item to the list.")
          lst.append(yitem)  #action that will be done if item was not found on the list

For completeness sake if something needs to be done if the item is found, then the code will be like this:

       if yitem in lst:   
         print "Item is found and is present on the list."
         #do something more if required
       else:
          print(" Item 'yitem' is not present in the list, appending item to the list.")
          lst.append(yitem) #action that will be done if item was not found on the list


Cheers! Till next time...enjoy Python programming and stay away from the real Python it's not forgiving.

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