pretty-format-json modifies floating point numbers that have too many digits of precision #780
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URL: http://github.com/pre-commit/pre-commit-hooks/issues/780
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pretty-format-jsonmodifies floating point numbers that have too many digits of precision.Background
I have to work with JSON files that may be generated by non-python programs. These files, for whatever reason, have numbers that have up to 16 digits after the decimal place.
(It's absurd, really. The people taking these measurements are somehow able to measure 0.1μHz on a 10GHz scale?? Yeah, they're saving values like
5.9257052820783001 GHz. Someone needs to teach them about significant figures... but that's beside the point. The point is I have to deal with this data 😒)Steps to Reproduce
{"foo": 4.4257052820783003}Expected Output:
{ "foo": 4.4257052820783003 }Actual Output:
{ "foo": 4.4257052820783 }The diff from expected is:
{ - "foo": 4.4257052820783003 + "foo": 4.4257052820783 }Version Info
Discussion
This might be something that has to be fixed within the python builtin
jsonpackage. A custom JSON encoder/decoder that wraps things usingdecimal.Decimalmight work too.I've created a test case for this. See my high-precision-numbers branch or the diff.
I'll see if I have time to actually fix this, but I don't expect to☹️ .