Issue 22134: string formatting float rounding errors (original) (raw)

Certain values close to the rounding boundary are rounded down instead of up; and this is done somewhat inconsistently.

#Example (python v2.7.8, and previous)

#almost an odd-even pattern, but not quite for x in [1.045, 1.145, 1.245, 1.345, 1.445, 1.545, 1.645, 1.745, 1.845, 1.945]: print "{0:.3f} => {0:.2f}".format(x)

#while ..6 rounds up correctly for x in [1.046, 1.146, 1.246, 1.346, 1.446, 1.546, 1.646, 1.746, 1.846, 1.946]: print "{0:.3f} => {0:.2f}".format(x)