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Home/ Questions/Q 6798997
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Editorial Team
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Editorial Team
Asked: May 26, 20262026-05-26T18:47:46+00:00 2026-05-26T18:47:46+00:00

Is there a way in Python to count the significant figures in a double/float/etc?

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Is there a way in Python to count the significant figures in a double/float/etc? I’m not seeing an easy way to do this, but I’d expect it to be in the library.

Thanks in advance.

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  1. Editorial Team
    Editorial Team
    2026-05-26T18:47:47+00:00Added an answer on May 26, 2026 at 6:47 pm

    No. Significant digits are just not that big a deal and get little support in computer languages. People doing real computations need error bars, which have far more precision — real measurements say very exact things like “this is 0.11 ± 0.03mm“ instead of saying either of the less exact statements “this is 0.1 mm” or “this is 0.11 mm” which makes you choose a power of ten even if your inexactness does not actually fall at a power of ten.

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