我正在尝试将 numpy.uint64 (由 numpy.sum() 输出)转换为小数,而不会丢失 Decimal 模块的精度。
>>> from decimal import Decimal
>>> import numpy as np
>>>
>>> sum = np.sum(1000000000000000000)
>>> type(sum)
<type 'numpy.int64'>
>>> Decimal(sum)
Decimal('1000000000000000000')
>>>
>>> sum = np.sum(1000000000000000000000)
>>> type(sum)
<type 'long'>
>>> Decimal(sum)
Decimal('1000000000000000000000')
>>>
>>> sum = np.sum(10000000000000000000)
>>> type(sum)
<type 'numpy.uint64'>
>>> Decimal(sum)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/decimal.py", line 657, in __new__
raise TypeError("Cannot convert %r to Decimal" % value)
TypeError: Cannot convert 10000000000000000000 to Decimal
decimal.Decimal
不理解 NumPy 输入,因此转换numpy.uint64
为 Python 标量item method https://docs.scipy.org/doc/numpy/reference/generated/numpy.ndarray.item.html打电话之前decimal.Decimal
:
Decimal(np.sum(whatever).item())
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