python - get max duplicate item in list -

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i have list:

mylist = [20, 30, 25, 20, 30]

after getting duplicated values indexes using 

[i i, x in enumerate(mylist) if mylist.count(x) > 1]

the result is: 

`[0, 1, 3, 4]`

having 2 pairs of duplicated values. i'd know, how can higher duplicated value? in list 30 or of it's indexes, 1 or 4, instead of whole list of duplicated values.

regards...

this 1 o(n)

>>> collections import counter >>> mylist = [20, 30, 25, 20, 30] >>> max(k k,v in counter(mylist).items() if v>1) 30

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