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Explicit assignment and `+=` yield different results if the index produces side effects
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| #!/usr/bin/env python | |
| # -*- coding: utf-8 -*- | |
| from itertools import count | |
| a = [1, 10] | |
| b = [1, 10] | |
| c1 = count(0).next | |
| c2 = count(0).next | |
| a[c1()] = a[c1()] + 1 | |
| b[c2()] += 1 | |
| print a # [1, 2] | |
| print b # [2, 10] |
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