[Tutor] Count for loops

[Alan Gauld]

On 11/04/17 19:44, Mats Wichmann wrote:

> import decimal
> 
> Pi_Number =
> str(decimal.Decimal(3.14159265358979323846264338327950288419716939))
> 

Unfortunately that doesn't work either:

>>> "   " + str(decimal.Decimal(
... 3.14159265358979323846264338327950288419716939))
'   3.141592653589793115997963468544185161590576171875'
>>>

Notice the output is both longer and has completely different
numbers in the last half of the result.


> topic. The decimal module documentation contains this pithy comment near
> the top:
> 
> Decimal “is based on a floating-point model which was designed with
> people in mind, and necessarily has a paramount guiding principle –
> computers must provide an arithmetic that works in the same way as the
> arithmetic that people learn at school.”

But sadly they haven't beat the problem of storing high precision
decimal numbers in binary storage.

-- 
Alan G
Author of the Learn to Program web site
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