[TIP] doctest and floats
Tim Head
betatim at gmail.com
Mon Mar 10 01:58:23 PDT 2008
Hi,
if you want to test a function that returns a float, what is the "one
way" to write that down in a doctest?
consider:
def foo(n):
"""
>>> foo(0.4)
0.4
>>> foo(0.1)
0.1
"""
return n
this will fail on the second one because 0.1 is one of these numbers
that can be represented completely in binary.
It feels wrong to write
>>> foo(0.1)
0.10000000000000001
however
>>> foo(0.1)
1./10.
does not work either.
Does anyone of you clever people have some experience with how to do
this properly?
cheers,
tim
--
http://tim.jottit.com/
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