27 lines
932 B
Python
27 lines
932 B
Python
"""
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Sometimes use of floats may lead to undesirable results, e.g.
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int(2.3 / 0.1) = 22.
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We cannot afford to use different number representations (e.g. representations
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provided by decimal or fraction modules), thus consequences are worked around by
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this module.
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"""
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import math
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import sys
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# As we will be rounding numbers after operations (which introduce higher error
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# than base float representation error), we need to keep less significant
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# numbers than for single float number w/o operations
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keepDigits = int(sys.float_info.dig / 2)
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def floatUnerr(value):
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"""Round possible float number error, killing some precision in process."""
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if value in (0, math.inf):
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return value
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# Find round factor, taking into consideration that we want to keep at least
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# predefined amount of significant digits
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roundFactor = int(keepDigits - math.ceil(math.log10(abs(value))))
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return round(value, roundFactor)
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