据我了解，2.675和numpy.float64（2.675）都是相同的数字。但是，round（2.675，2）得到2.67，而round（np.float64（2.675），2）得到2.68。为什么会这样？
import numpy as np
from decimal import Decimal
x = 2.675
np_x = np.float64(x)
type(x) # float
Decimal(x) # Decimal('2.67499999999999982236431605997495353221893310546875')
Decimal(np_x) # Decimal('2.67499999999999982236431605997495353221893310546875')
x == np_x # True
# This is the bit that bothers me
round(x, 2) # 2.67
round(np_x, 2) # 2.68
# Using numpy's round gives 2.68 for both the numpy float as well as the Python built-in float...
np.round(x, 2) # 2.68
np.round(np_x, 2) # 2.68
# ... but this is because it might be …