list.count does not appear to function

[Oldman45]

Thank you Sandeep_ganga, snippsat & Buran.
I get that - I was not using the print statement correctly not recognising I had called up print the original list and not the count result. However if I use mylist.reverse I have to revert to the my initial way of working as belowL

mylist = [5, 12, 27, 3, 12, 5, 9, 5, 11]
mylist.reverse()
print(mylist)

which gives the correct output of

Output:
[11, 5, 9, 5, 12, 3, 27, 12, 5]

Is this because I am using () in the call and not specifying anything between ()?

Thanks