Check if object occurs more than 2 times in list

Question

In python, how do I check if an objects occurs more than 2 times. So basically

test = [object1,object2,object1,object1]
#some stuff
test = [object1]

or

test =[object1,object2,object1,object2,object1,object2]
#some stuff
test =[object1,object2]

You may use `Counter()` to get the frequency distribution of each object and then threshold it on frequencies. — ZdaR, Jun 23 '17 at 09:23

selten98 · Accepted Answer · 2017-06-23T09:26:51.563

3

a = ['a', 'b', 'c', 'a', 'a']
list(set([x for x in a if a.count(x) > 2]))

This returns

['a']

If you need unique values, wrap it in a set.

edited Jun 23 '17 at 09:26

answered Jun 23 '17 at 09:25

selten98

he just wants the items once on the resulting list – Ma0 Jun 23 '17 at 09:26
Just note, you are getting quadratic time complexity here. – juanpa.arrivillaga Jun 23 '17 at 09:27
@juanpa.arrivillaga Thanks for pointing that out, I didn't realise that. – selten98 Jun 23 '17 at 09:28
@selten98 I dont think this would be a problem since list size will be maximum 8 – greedsin Jun 23 '17 at 10:18

1 Answers1