Python
{{{
>>> 0.1 + 0.1 + 0.1
0.30000000000000004

>>> 0.1 + 0.1 + 0.1 == 0.3
False
}}}
{{{
>>> 0.1 + 0.1
0.2

>>> 0.1 + 0.1 == 0.2
True
}}}

Python
{{{
>>> import sys
>>> sys.float_info.epsilon
2.220446049250313e-16
}}}