Q:

Display all duplicate items from a list using python programming

YasminRadwan26
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2022-05-05
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Display all duplicate items from a list

Given:

sample_list = [10, 20, 60, 30, 20, 40, 30, 60, 70, 80]

Expected Output: -

[20, 60, 30]
Python programming,
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YasminRadwan26
2022-05-05
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Hint:

  1. Use the counter() method of the collection module.
  2. Create a dictionary that will maintain the count of each item of a list. Next, Fetch all keys whose value is greater than 2

Solution1:Using collections.Counter()

import collections

sample_list = [10, 20, 60, 30, 20, 40, 30, 60, 70, 80]

duplicates = []
for item, count in collections.Counter(sample_list).items():
    if count > 1:
        duplicates.append(item)
print(duplicates)

Solution2:

sample_list = [10, 20, 60, 30, 20, 40, 30, 60, 70, 80]
exist = {}
duplicates = []

for x in sample_list:
    if x not in exist:
        exist[x] = 1
    else:
        duplicates.append(x)
print(duplicates)

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