drop trailing zeros from decimal

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You can use the normalize method to remove extra precision.

>>> print decimal.Decimal('5.500')
5.500
>>> print decimal.Decimal('5.500').normalize()
5.5

To avoid stripping zeros to the left of the decimal point, you could do this:

def normalize_fraction(d):
    normalized = d.normalize()
    sign, digits, exponent = normalized.as_tuple()
    if exponent > 0:
        return decimal.Decimal((sign, digits + (0,) * exponent, 0))
    else:
        return normalized

Or more compactly, using quantize as suggested by user7116: 

def normalize_fraction(d):
    normalized = d.normalize()
    sign, digit, exponent = normalized.as_tuple()
    return normalized if exponent <= 0 else normalized.quantize(1)

You could also use to_integral() as shown here but I think using as_tuple this way is more self-documenting.

I tested these both against a few cases; please leave a comment if you find something that doesn’t work. 

>>> normalize_fraction(decimal.Decimal('55.5'))
Decimal('55.5')
>>> normalize_fraction(decimal.Decimal('55.500'))
Decimal('55.5')
>>> normalize_fraction(decimal.Decimal('55500'))
Decimal('55500')
>>> normalize_fraction(decimal.Decimal('555E2'))
Decimal('55500')

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