Максимальное число float в питоне

What is the maximum float in Python?

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

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

int has unlimited precision, so it’s only limited by available memory.

Note sys.float_info.min is defined as «minimum positive normalized float». Smaller denormal values are possible, down to 5e-324

Cool, both are very useful. inf for all things python, and float_info.max as a workaround when the earlier doesn’t work, for example time.sleep(float(«inf»)) is not allowed 🙁

@ladyfafa: sys.maxint is gone in Python 3, see also comments in the other answer and stackoverflow.com/questions/13795758/…

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

+1 This is important. In Py3k, it’s nearly meaningless — it’s the point at which Python (transparently!) changes the underlying datatype to long .

@katrielalex: sys.maxint isn’t even defined in Python 3, it’s called sys.maxsize , which is probably to be preferred in Python 2 as well.

@Scott Griffiths: Not quite. sys.maxsize (introduced in Python 2.6) and sys.maxint are two different things. The first gives the maximum number of objects allowed in a collection (e.g., maximum size of a list, dict, etc.), and corresponds to a signed version of the C size_t type; the second is the point after which the int type switches to long , and is the max value of a C long . On some platforms the two values are different: e.g., on 64-bit Windows, sys.maxsize is 2**63-1 and sys.maxint is 2**31-1 .

@Mark Dickinson: Thanks for the correction — I hadn’t realised they could ever be different (with 64-bit Python on Snow Leopard they are both 2**63-1 ).

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Python max float – What’s the Maximum Float Value in Python?

The maximum float value in Python is 1.7976931348623157e+308. To find the max float in Pythoon, we can use the sys module and access the float_info property.

import sys print(sys.float_info) #Output: 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)

When working with numbers in any programming language, knowing the min and max values can be useful so you don’t raise any errors in your code.

For floating point numbers in Python, the maximum value can be found through the sys module.

We access the float_info property from the sys module and can see the maximum floating point value for Python.

import sys print(sys.float_info) #Output: 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)

As shown above, the max float value possible in Python is 1.7976931348623157e+308.

The Minimum Float Value in Python

From the float_info property of the sys module, we can also get the minimum float value in Python. As we can see in the code output from above, the minimum float value in Python is 2.2250738585072014e-308.

Hopefully this article has been useful for you to find the maximum float value in Python.

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Find Maximum Float Value in Python

1. Find Maximum Float Value in Python Using sys.float_info
2. Find Maximum Float Value in Python Using the finfo() Function of the Numpy Library
3. Conclusion

Python supports many data types such as integer, float, string, etc. All of them have been assigned a minimum and a maximum value between which the compiler can accept the values.

This article will discuss how to find out the maximum value that the float data type supports.

There are mainly two ways to find the maximum value of float data type in Python. One is the use of sys.float_info that holds the information about the float data type in Python, and the second is to use the finfo() function of the numpy library to return machine limits of the floating-point numbers.

We will see each one of them in detail in this article.

Find Maximum Float Value in Python Using sys.float_info

The sys.float_info is a named tuple that holds information such as the precision and internal representation of the float data type.

To use sys.float_info in our code, we must first import the in-built sys module defined in Python, which provides certain variables and functions used to manipulate various parts of the Python runtime environment.

However, the sys.float_info will give us all the information about the float data type. It is demonstrated using the code below.

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) 

However, we need to find the maximum value of the float data type. Therefore, we will use sys.float_info.max , which will only provide the maximum float data type value in Python.

Let us see the code to demonstrate the use of sys.float_info.max .

import sys sys.float_info.max 

Find Maximum Float Value in Python Using the finfo() Function of the Numpy Library

If you are using the numpy library of Python, you can easily find the maximum value of the float data type. It contains a function called finfo() , which takes float , dtype or instance as an argument and returns the machine limit for the floating-point types.

However, before using the finfo() function, you first need to import the numpy library in the code. After which, you need to call the finfo function with np.float64 as the argument where np is the alias name used for the numpy library.

Let us see how to code the same.

import numpy as np np.finfo(np.float64) 

finfo(resolution=1e-15, min=-1.7976931348623157e+308, max=1.7976931348623157e+308, dtype=float64) 

However, the above function gives the minimum machine limit for the float data type. You can use np.finfo(np.float64).max for just printing the maximum value of the float data type in Python.

Let us see the code for finding the maximum value of the float data type.

import numpy as np np.finfo(np.float64).max 

Conclusion

In this article, we have seen two different methods to find the maximum value of the float data type in Python. One of them is to use the float_info.max of the sys module, and the second method is to use the finfo() function of the numpy library in Python.

Both the methods explained above are pretty efficient and can be used to serve our purpose in no time.

Related Article — Python Float

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