Changes to PEP 327: Decimal data type

[Batista, Facundo]

People:

I'll post a reviewed version of the PEP.

The only differences with the previous one will be the treatmen to float in
both explicit and implicit construction:

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In Explicit construction:

You can not call Decimal with a float. Instead you must use a method:
Decimal.fromFloat(). The syntax:

    Decimal.fromFloat(floatNumber, positions)
    
where floatNumber is the float number origin of the construction and
positions is the positions after the decimal point where you apply a
round-half-up
rounding. In this way you can do, for example:

    Decimal.fromFloat(1.1, 2): The same that doing Decimal('1.1').
    Decimal.fromFloat(1.1, 16): The same that doing
Decimal('1.1000000000000001').
    Decimal.fromFloat(1.1): The same that doing
Decimal('110000000000000008881784197001252...e-51').


In Implicit construction:

Raise TypeError. You can not mix Decimal and float.

------------

If you're ok, I'll post this.

Thank you!

.	Facundo