What is sys maxint in Python 3

Question

I ve been trying to find out how to represent a maximum integer  and I ve read to use  sys maxint   However  in Python 3 when I call it I get   AttributeError  module  object  has no attribute  maxint

User · Answer

Python 3 0 doesn t have sys maxint any more since Python 3 s ints are of arbitrary length  Instead of sys maxint it has sys maxsize  the maximum size of a positive sized size t aka Py ssize t

User · Answer

Python 3 ints do not have a maximum   If your purpose is to determine the maximum size of an int in C when compiled the same way Python was  you can use the struct module to find out    gt  gt  gt  import struct  gt  gt  gt  platform c maxint   2     struct Struct  i   size   8 - 1  - 1   If you are curious about the internal implementation details of Python 3 int objects  Look at sys int info for bits per digit and digit size details  No normal program should care about these

User · Answer

As pointed out by others  Python 3 s int does not have a maximum size  but if you just need something that s guaranteed to be higher than any other int value  then you can use the float value for Infinity  which you can get with float  inf

User · Answer

If you are looking for a number that is bigger than all others  Method 1  float  inf    Method 2  import sys max   sys maxsize  If you are looking for a number that is smaller than all others  Method 1  float  -inf    Method 2  import sys min   -sys maxsize - 1  Method 1 works in both Python2 and Python3  Method 2 works in Python3  I have not tried Method 2 in Python2

User · Answer

An alternative is  import math      math inf

User · Answer

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     http   docs python org 3 1 whatsnew 3 0 html integers

[python] What is sys.maxint in Python 3?

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