Ambiguity between Decimal and Float point numbers in python?

Question

I have a value stored in a field as type DecimalField . When I print it, the value I get is
>>> sr.to_value Decimal('9.99')
Now when I compare it to a float number
>>> sr.to_value < 9.99 True
Why is this happening ?

Answer 1

Most likely due to floating point inaccuracies, take a look at the docs here for a proper explanation:

https://docs.python.org/3.5/tutorial/floatingpoint.html

Example:

>>> .1 + .1 + .1 == .3
False