First solution in Clear category for Non-unique Elements by lyapun
#Your optional code here
#You can import some modules or create additional functions
#Your code here
#It's main function. Don't remove this function
#It's used for auto-testing and must return a result for check.
return list(filter(lambda element: data.count(element) > 1, data))
#You can use list.count(element) method for counting.
#Create new list with non-unique elements
#or remove elements from original list (but it's bad practice for many real cases)
#Loop over original list
May 19, 2014