Python中的最大浮点数是多少?

问题:Python中的最大浮点数是多少?

我认为可以通过调用python中的最大整数sys.maxint

最大值floatlongPython中的最大值是多少?

I think the maximum integer in python is available by calling sys.maxint.

What is the maximum float or long in Python?


回答 0

对于float看看sys.float_info

>>> import sys
>>> sys.float_info
sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2
250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsil
on=2.2204460492503131e-16, radix=2, rounds=1)

具体来说sys.float_info.max

>>> sys.float_info.max
1.7976931348623157e+308

如果那还不够大,那么总会有正无穷大

>>> infinity = float("inf")
>>> infinity
inf
>>> infinity / 10000
inf

long类型具有无限的精度,因此我认为您仅受可用内存的限制。

For float have a look at sys.float_info:

>>> import sys
>>> sys.float_info
sys.floatinfo(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2
250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsil
on=2.2204460492503131e-16, radix=2, rounds=1)

Specifically, sys.float_info.max:

>>> sys.float_info.max
1.7976931348623157e+308

If that’s not big enough, there’s always positive infinity:

>>> infinity = float("inf")
>>> infinity
inf
>>> infinity / 10000
inf

The long type has unlimited precision, so I think you’re only limited by available memory.


回答 1

sys.maxint不是python支持的最大整数。它是python的常规整数类型支持的最大整数。

sys.maxint is not the largest integer supported by python. It’s the largest integer supported by python’s regular integer type.


回答 2

如果您使用numpy的,你可以使用D型float128 ”,并得到的最大浮动10E + 4931

>>> np.finfo(np.float128)
finfo(resolution=1e-18, min=-1.18973149536e+4932, max=1.18973149536e+4932, dtype=float128)

If you are using numpy, you can use dtypefloat128‘ and get a max float of 10e+4931

>>> np.finfo(np.float128)
finfo(resolution=1e-18, min=-1.18973149536e+4932, max=1.18973149536e+4932, dtype=float128)