Maximum and Minimum values for ints

Question

I am looking for minimum and maximum values for integers in python  For eg   in Java  we have Integer MIN VALUE and Integer MAX VALUE  Is there something like this in python

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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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For Python 3  it is  import sys max   sys maxsize min   -sys maxsize - 1

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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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In Python 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    gt  gt  gt  9223372036854775807 9223372036854775807  gt  gt  gt  9223372036854775808 9223372036854775808L   From the Python 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    gt  gt  gt  10  100 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000L

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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    PEP 238  An expression like 1 2 returns a float  Use 1  2 to get the truncating behavior   The latter syntax has existed for years  at   least since Python 2 2     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     The repr   of a long integer doesn   t include the trailing L anymore  so code that unconditionally strips that character will chop off the   last digit instead   Use str   instead     Octal literals are no longer of the form 0720  use 0o720 instead       Refer   https   docs python org 3 whatsnew 3 0 html integers

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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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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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You may use  inf  like this   import math bool true   0  lt  math inf bool false   0  lt  -math inf   Refer  math     Mathematical functions

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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    gt  gt  gt  sys maxint 9223372036854775807   You can calculate the minimum value with -sys maxint - 1 as shown here    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

[python] Maximum and Minimum values for ints

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