What is the maximum float in Python?

I think the maximum integer in pyth开发者_C百科on is available by calling sys.maxint.

What is the maximum float or long in Python?

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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.

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

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If you are using numpy, you can use dtype 'float128' 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)

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In python 3 there is no sys.maxint There is a sys.maxsize

>>> sys.maxsize
2147483647

That does not mean that the maximum int is limited to 2 billion! It means that the size of the object containing the integer has a maximum size of 2 billion bytes. I.e. a very very large number

For float have a look at sys.float_info

>>> sys.float_info
sys.float_info(max=1.7976931348623157e+308, max_exp=1024, max_10_exp=308, min=2.2250738585072014e-308, min_exp=-1021, min_10_exp=-307, dig=15, mant_dig=53, epsilon=2.220446049250313e-16, radix=2, rounds=1)

And specifically sys.float_info.max

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