Significant digits in a float?

[Roy Smith]

On Monday, April 28, 2014 12:07:14 PM UTC-4, Ned Batchelder wrote:

> On 4/28/14 12:00 PM, Roy Smith wrote:
>> 38.0  ==> 0
>> [...]
>> Is there any clean way to do that?  The best I've come up with so far is to str() them and parse the
>> remaining string to see how many digits it put after the decimal point.
> 
> That sounds like a pretty clean way:  len(str(num).partition(".")[2]), 
> though it also sounds like you understand all of the inaccuracies in 

Well, it's actually, a little uglier, because I want to map 38.0 ==>0, so I need to special case that.

The other annoying thing about using str() is its behavior isn't well defined.  It looks like it does the right thing, but I imagine the details could change in a different implementation.