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First solution in Clear category for Non-unique Elements by jacekgrycza
#Your optional code here
#You can import some modules or create additional functions
def checkio(data):
d=len(data)
k=d
l=0
o=0
x=[0 for i in range(0,d)]
for i in range(0,d):
for j in range(0, d):
if (data[i]==data[j] and i!=j):
x[l]=data[i]
l=l+1
o=o+1
break
y=[x[i] for i in range(0,o)]
return(y)
if __name__ == "__main__":
#These "asserts" using only for self-checking and not necessary for auto-testing
assert isinstance(checkio([1]), list), "The result must be a list"
assert checkio([1, 2, 3, 1, 3]) == [1, 3, 1, 3], "1st example"
assert checkio([1, 2, 3, 4, 5]) == [], "2nd example"
assert checkio([5, 5, 5, 5, 5]) == [5, 5, 5, 5, 5], "3rd example"
assert checkio([10, 9, 10, 10, 9, 8]) == [10, 9, 10, 10, 9], "4th example"
Oct. 17, 2016
