使用python 3.6
https://docs.python.org/3.6/library/decimal.html

我可以看到我们可以指定舍入和精度,但是只能通过设置上下文来全局指定.

如何为特定的Decimal实例执行此操作？

像这样的伪代码：

myNumber = Decimal(1.101901)
roundedNumber = myNumber.toFixed(2, ROUND_DOWN)
# expected result ==> 1.10
roundedNumber = myNumber.toFixed(2, ROUND_UP)
# expected result ==> 1.11

因此,我可以使用所需的舍入和精度来解析每个数字.

解决方法:

使用方法Decimal.quantize.

from decimal import *

myNumber = Decimal(1.101901)
roundedNumber = myNumber.quantize(Decimal('1.00'), rounding=ROUND_DOWN) # 1.10
roundedNumber = myNumber.quantize(Decimal('1.00'), rounding=ROUND_UP)   # 1.11