Question

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Find and list duplicates in Python list

I have this script in Python:

routes = Trayect.objects.extra(where=['point_id IN (10,59)'])

for route in routes:
    print route

I get this response:

6
106
114
110
118
158
210
110
102
105
110
120
195
106

As you note “110” route is repeated 3 times and “106” is repeated 2 times.

How i can do for obtain only the repeated number?

I want only 110 and 106, not others. Just this:

106
110

Im not a native English speaker, and I am learning python. Thanks

***The objects in list are strings

Answer 1

This is probably the most straightforward way to do it, and also efficient even if routes has many items in it:

from collections import Counter

counts = Counter(routes)

multi_routes = [i for i in counts if counts[i] > 1]

Example usage (using numbers, but this will work for hashable type, e.g. strings are fine):

>>> from collections import Counter
>>> c = Counter([1,1,2,3,3,4,5,5,5])
>>> [i for i in c if c[i] > 1]
[1, 3, 5]