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Puzzle 9: Explanation

Understand floating point behavior in Python puzzles including why outputs differ from mathematical expectations. Learn about floating point limitations, rounding trade-offs, and techniques like assertAlmostEqual and math.isnan to handle comparisons and special values effectively.

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Try it yourself

Try executing the code below to verify the result:

Python 3.8
print(1.1 * 1.1)

Explanation

You might have expected the correct answer to be 1.21, which is the correct answer mathematically. When seeing this or similar output, some new developers go ...