Maximum value for long integer

Question

How can I assign the maximum value for a long integer to a variable  similar  for example  to C   s LONG MAX

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long type in Python 2 x uses arbitrary precision arithmetic and has no such thing as maximum possible value  It is limited by the available memory  Python 3 x has no special type for values that cannot be represented by the native machine integer     everything is int and conversion is handled behind the scenes

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In python3  you can send the float value into the int function the get that number 1 7976931348623157e 308 in integer representation   import sys     int sys float info max

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Direct answer to title question   Integers are unlimited in size and have no maximum value in Python   Answer which addresses stated underlying use case   According to your comment of what you re trying to do  you are currently thinking something along the lines of  minval   MAXINT  for  i   1  i  lt  num elems  i        if a i   lt  a i-1          minval   a i     That s not how to think in Python  A better translation to Python  but still not the best  would be  minval   a 0     Just use the first value for i in range 1  len a        minval   min a i   a i - 1     Note that the above doesn t use MAXINT at all  That part of the solution applies to any programming language  You don t need to know the highest possible value just to find the smallest value in a collection   But anyway  what you really do in Python is just  minval   min a    That is  you don t write a loop at all  The built-in min   function gets the minimum of the whole collection

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Long integers   There is no explicitly defined limit  The amount of available address space forms a practical limit   Taken from this site   See the docs on Numeric Types where you ll see that Long integers have unlimited precision  In Python 2  Integers will automatically switch to longs when they grow beyond their limit    gt  gt  gt  import sys  gt  gt  gt  type sys maxsize   lt type  int  gt   gt  gt  gt  type sys maxsize 1   lt type  long  gt     for integers we have  maxint and maxsize   The maximum value of an int can be found in Python 2 x with sys maxint  It was removed in Python 3  but sys maxsize can often be used instead  From the changelog      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     and  for anyone interested in the difference  Python 2 x       sys maxint The largest positive integer supported by Python   s regular   integer type  This is at least 2  31-1  The largest negative integer   is -maxint-1     the asymmetry results from the use of 2   s complement   binary arithmetic       sys maxsize The largest positive integer supported by the platform   s   Py ssize t type  and thus the maximum size lists  strings  dicts  and   many other containers can have    and for completeness  here s the Python 3 version      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    floats   There s float  inf   and float  -inf    These can be compared to other numeric types    gt  gt  gt  import sys  gt  gt  gt  float  inf    gt  sys maxsize True

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Unlike C C   Long  in Python have unlimited precision  Refer the section Numeric Types  in python for more information To determine the max value of integer you can just refer sys maxint  You can get more details from the documentation of sys

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Python long can be arbitrarily large  If you need a value that s greater than any other value  you can use float  inf    since Python has no trouble comparing numeric values of different types  Similarly  for a value lesser than any other value  you can use float  -inf

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A  For a cheap comparison   arithmetics dummy use math inf  Or math nan  which compares FALSE in any direction  including nan    nan  except identity check  is  and renders any arithmetics  like nan - nan  nan  Or a reasonably high real integer number according to your use case  e g  sys maxsize   For a bitmask dummy  e g  in mybits  amp  bitmask  use -1  B  To get the platform primitive maximum signed long int  or long long    gt  gt  gt  256    sys int info sizeof digit    2 - 1    Python   s internal primitive 2147483647  gt  gt  gt  256    ctypes sizeof ctypes c long     2 - 1    CPython 2147483647  gt  gt  gt  256    ctypes sizeof ctypes c longlong     2 - 1    CPython 9223372036854775807  gt  gt  gt  2  63 - 1    Java   JPython primitive long 9223372036854775807  C  The maximum Python integer could be estimated by a long running loop teasing for a memory overflow  try 256  int 8e9  - can be stopped by KeyboardInterrupt   But it cannot not be used reasonably  because its representation already consumes all the memory and its much greater than sys float info max

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You can use  max value of float is    float  inf     for negative  float  -inf

[python] Maximum value for long integer

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