circuitpython/tests/float/string_format_modulo3.py
Damien George 6ed4581f54 py/formatfloat: Fix number of digits and exponent sign when rounding.
This patch fixes 2 things when printing a floating-point number that
requires rounding up of the mantissa:
- retain the correct precision; eg 0.99 becomes 1.0, not 1.00
- if the exponent goes from -1 to 0 then render it as +0, not -0
2017-06-13 13:36:56 +10:00

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Python

# uPy and CPython outputs differ for the following
print("%.1g" % -9.9) # round up 'g' with '-' sign
print("%.2g" % 99.9) # round up