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How Python Compares Floats and Ints: When Equals Isn’t Really Equal
(blog.codingconfessions.com)
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this post was submitted on 27 May 2024
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The "15 to 17" part is worded somewhat confusingly, but it's not wrong.
The number of bits contained in a double is equivalent to ~15.95 decimal digits. If you want to store exactly a decimal number with a fixed number of significant digits,
floor(15.95) = 15digits is the most you can hope for. However, if you want to store exactly a double by writing it out as a decimal number, you need 17 digits.