Strange/odd outcome in decimals

[Jeff900]

A few weeks ago I wanted to simply print the outcome of some calculations, just as a reference at that moment. But ever since I am still wondering why some of the results has 16 decimals with the last result not exactly 0. It was a calculation as below, but it happens with other decimals too: not only 0.4.

for item in range(10):
    print(item * 0.4)

Output:
0.0
0.4
0.8
1.2000000000000002
1.6
2.0
2.4000000000000004
2.8000000000000003
3.2
3.6

It might be explainable, maybe even mathematical, but I still can't figure out why this happens. Someone has an idea?