camelcaseblog/02 epsilon comparison

## 02 epsilon comparison
>>> 0.1 + 0.2 == 0.3
False

>>> def compare(a, b, epsilon=0.00001):
...     return abs(a - b) < epsilon
...
>>> compare(0.1 + 0.2, 0.3)
True
	>>> 0.1 + 0.2 == 0.3
	False

	>>> def compare(a, b, epsilon=0.00001):
	... return abs(a - b) < epsilon
	...
	>>> compare(0.1 + 0.2, 0.3)
	True