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First exercise. Don't modify lists while iterating over them solution in Clear category for Non-unique Elements by elpythonista
def checkio(data):
#create new list to copy repeated numbers and avoid iteration mistakes
copy = []
for i in data:
#copy numbers repeated 2 or more times
if(data.count(i) >= 2):
copy.append(i)
return copy
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"
Jan. 25, 2015
