How can I represent an infinite number in Python

Question

How can I represent an infinite number in python  No matter which number you enter in the program  no number should be greater than this representation of infinity

User · Answer

I don t know exactly what you are doing  but float  inf   gives you a float Infinity  which is greater than any other number

User · Answer

Since Python 3 5 you can use math inf    gt  gt  gt  import math  gt  gt  gt  math inf inf

User · Answer

In python2 x there was a dirty hack that served this purpose  NEVER use it unless absolutely necessary    None  lt  any integer  lt  any string   Thus the check i  lt     holds True for any integer i   It has been reasonably deprecated in python3  Now such comparisons end up with  TypeError  unorderable types  str    lt  int

User · Answer

There is an infinity in the NumPy library  from numpy import inf  To get negative infinity one can simply write -inf

User · Answer

No one seems to have mentioned about the negative infinity explicitly  so I think I should add it  For negative infinity  -math inf  For positive infinity  just for the sake of completeness   math inf

User · Answer

In Python  you can do   test   float  inf     In Python 3 5  you can do   import math test   math inf   And then   test  gt  1 test  gt  10000 test  gt  x   Will always be true  Unless of course  as pointed out  x is also infinity or  nan    not a number     Additionally  Python 2 x ONLY   in a comparison to Ellipsis  float inf  is lesser  e g   float  inf    lt  Ellipsis   would return true

User · Answer

Another  less convenient  way to do it is to use Decimal class   from decimal import Decimal pos inf   Decimal  Infinity   neg inf   Decimal  -Infinity

User · Answer

Also if you use SymPy you can use sympy oo   gt  gt  gt  from sympy import oo  gt  gt  gt  oo   1 oo  gt  gt  gt  oo - oo nan   etc

[python] How can I represent an infinite number in Python?

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