Maximum and Minimum values for ints

How do I represent minimum and maximum values for integers in Python? In Java, we have Integer.开发者_运维知识库MIN_VALUE and Integer.MAX_VALUE.

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_{See also: What is the maximum float in Python?.}

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Python 3

In Python 3, this question doesn't apply. The plain int type is unbounded.

However, you might actually be looking for information about the current interpreter's word size, which will be the same as the machine's word size in most cases. That information is still available in Python 3 as sys.maxsize, which is the maximum value representable by a signed word. Equivalently, it's the size of the largest possible list or in-memory sequence.

Generally, the maximum value representable by an unsigned word will be sys.maxsize * 2 + 1, and the number of bits in a word will be math.log2(sys.maxsize * 2 + 2). See this answer for more information.

Python 2

In Python 2, the maximum value for plain int values is available as sys.maxint:

>>> sys.maxint  # on my system, 2**63-1
9223372036854775807

You can calculate the minimum value with -sys.maxint - 1 as shown in the docs.

Python seamlessly switches from plain to long integers once you exceed this value. So most of the time, you won't need to know it.

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If you just need a number that's bigger than all others, you can use

float('inf')

in similar fashion, a number smaller than all others:

float('-inf')

This works in both python 2 and 3.

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The sys.maxint constant has been removed from Python 3.0 onward, instead use sys.maxsize.

Integers

• PEP 237: Essentially, long renamed to int. That is, there is only one built-in integral type, named int; but it behaves mostly like the old long type.

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• The sys.maxint constant was removed, since there is no longer a limit to the value of integers. However, sys.maxsize can be used as an integer larger than any practical list or string index. It conforms to the implementation’s “natural” integer size and is typically the same as sys.maxint in previous releases on the same platform (assuming the same build options).

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For Python 3, there is no maximum or minimum value for the int type.

You might be interested in sys.maxsize instead. According to the documentation:

sys.maxsize

An integer giving the maximum value a variable of type Py_ssize_t can take. It’s usually 2**31 - 1 on a 32-bit platform and 2**63 - 1 on a 64-bit platform.

import sys
max_size = sys.maxsize
min_size = -sys.maxsize - 1

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In Python 2, integers will automatically switch from a fixed-size int representation into a variable width long representation once you pass the value sys.maxint, which is either 2³¹ - 1 or 2⁶³ - 1 depending on your platform. Notice the L that gets appended here:

>>> 9223372036854775807
9223372036854775807
>>> 9223372036854775808
9223372036854775808L

From the Python 2.7 manual:

Numbers are created by numeric literals or as the result of built-in functions and operators. Unadorned integer literals (including binary, hex, and octal numbers) yield plain integers unless the value they denote is too large to be represented as a plain integer, in which case they yield a long integer. Integer literals with an 'L' or 'l' suffix yield long integers ('L' is preferred because 1l looks too much like eleven!).

Python tries very hard to pretend its integers are mathematical integers and are unbounded. It can, for instance, calculate a googol with ease:

>>> 10**100
10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000L

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You may use 'inf' like this:

import math
bool_true = 0 < math.inf
bool_false = 0 < -math.inf

Refer: math — Mathematical functions

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If you want the max for array or list indices (equivalent to size_t in C/C++), you can use numpy:

np.iinfo(np.intp).max

This is same as sys.maxsize however advantage is that you don't need import sys just for this.

If you want max for native int on the machine:

np.iinfo(np.intc).max

You can look at other available types in doc.

For floats you can also use sys.float_info.max.

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sys.maxsize is not the actually the maximum integer value which is supported. You can double maxsize and multiply it by itself and it stays a valid and correct value.

However, if you try sys.maxsize ** sys.maxsize, it will hang your machine for a significant amount of time. As many have pointed out, the byte and bit size does not seem to be relevant because it practically doesn't exist. I guess python just happily expands it's integers when it needs more memory space. So in general there is no limit.

Now, if you're talking about packing or storing integers in a safe way where they can later be retrieved with integrity then of course that is relevant. I'm really not sure about packing but I know python's pickle module handles those things well. String representations obviously have no practical limit.

So really, the bottom line is: what is your applications limit? What does it require for numeric data? Use that limit instead of python's fairly nonexistent integer limit.

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I rely heavily on commands like this.

python -c 'import sys; print(sys.maxsize)'

Max int returned: 9223372036854775807

For more references for 'sys' you should access

https://docs.python.org/3/library/sys.html

https://docs.python.org/3/library/sys.html#sys.maxsize

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code given below will help you. for maximum value you can use sys.maxsize and for minimum you can negate same value and use it.

import sys 

ni=sys.maxsize
print(ni)