Package orm2 :: Package util :: Module fixedpoint

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Module fixedpoint

source code

Classes

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object

FixedPoint
Basic FixedPoint object class,...

Functions

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bankersRounding(self, dividend, divisor, quotient, remainder)
...

addHalfAndChop(self, dividend, divisor, quotient, remainder)
...

property(x, y)

_tento(n, cache={})
Cached computation of 10**n...

_norm(x, y, isinstance=<built-in function isinstance>, FixedPoint=<class 'orm2.util.fixedpoint.FixedPoint'>, _tento=<function _tento at 0x77b5f0>)
Return xn, yn, p s.t.

_mkFP(n, p, FixedPoint=<class 'orm2.util.fixedpoint.FixedPoint'>)
Make FixedPoint objext - Return a new FixedPoint object with the selected precision.

_parser(...)

_string2exact(s)
Return n, p s.t.

_test()
Unit testing framework...

Variables

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__copyright__ = 'Copyright (C) Python Software Foundation'

__author__ = 'Tim Peters'

__version__ = (0, 1, 0)

DEFAULT_PRECISION = 2

Function Details

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bankersRounding(self, dividend, divisor, quotient, remainder)

source code


rounding via nearest-even
increment the quotient if
     the remainder is more than half of the divisor
  or the remainder is exactly half the divisor and the quotient is odd

addHalfAndChop(self, dividend, divisor, quotient, remainder)

source code


the equivalent of 'add half and chop'
increment the quotient if
     the remainder is greater than half of the divisor
  or the remainder is exactly half the divisor and the quotient is >= 0

property(x, y)

source code

None

_tento(n, cache={})

source code

Cached computation of 10**n

_norm(x, y, isinstance=<built-in function isinstance>, FixedPoint=<class 'orm2.util.fixedpoint.FixedPoint'>, _tento=<function _tento at 0x77b5f0>)

source code

Return xn, yn, p s.t.
   p = max(x.p, y.p)
   x = xn / 10**p
   y = yn / 10**p

x must be FixedPoint to begin with; if y is not FixedPoint,
it inherits its precision from x.

Note that this method is called a lot, so default-arg tricks are helpful.

_mkFP(n, p, FixedPoint=<class 'orm2.util.fixedpoint.FixedPoint'>)

source code

Make FixedPoint objext - Return a new FixedPoint object with the selected precision.

_parser(...)

None

_string2exact(s)

source code

Return n, p s.t. float string value == n * 10**p exactly.

_test()

source code

Unit testing framework

Variables Details

[hide private]

copyright

None

Value:

'Copyright (C) Python Software Foundation'

author

None

Value:

'Tim Peters'

version

None

Value:

(0, 1, 0)

DEFAULT_PRECISION

None

Value: