Tim Peters wrote:
[Raymond Hettinger]
from decimal import getcontext, Decimal as D
getcontext().prec = 3
D('3.104') + D('2.104')
Decimal(5.21)
D('3.104') + D('0.000') + D('2.104')
Decimal(5.20)
the results differ here because D(whatever)
ignores context settings; having a common operation
[Greg Ewing]
I don't see it's because of that. Even if D(whatever)
didn't ignore the context settings, you'd get the same
oddity if the numbers came from somewhere else with a
different precision.
Most users don't change context precision, and in that case there is
no operation defined in the
+def sin(x):
+Return the sine of x as measured in radians.
+do with_extra_precision():
+i, lasts, s, fact, num, sign = 1, 0, x, 1, x, 1
+while s != lasts:
+lasts = s
+i += 2
+
[Raymond Hettinger]
...
One more change: The final return +s should be unindented. It should
be at the same level as the do with_extra_precision(). The purpose of
the +s is to force the result to be rounded back to the *original*
precision.
This nuance is likely to be the bane of folks
