pydicom.valuerep.DSfloat¶

Store value for an element with VR DS as float.

If constructed from an empty string, return the empty string, not an instance of this class.

Parameters:

val (str | int | float | Decimal) – Value to store as a DS.
auto_format (bool) – If True, automatically format the string representation of this number to ensure it satisfies the constraints in the DICOM standard. Note that this will lead to loss of precision for some numbers.

__init__(val: str | int | float | Decimal, auto_format: bool = False, validation_mode: int | None = None) → None[source]¶: Store the original string if one given, for exact write-out of same value later.

Methods

`__init__`(val[, auto_format, validation_mode])	Store the original string if one given, for exact write-out of same value later.
`as_integer_ratio`()	Return integer ratio.
`conjugate`()	Return self, the complex conjugate of any float.
`fromhex`()	Create a floating-point number from a hexadecimal string.
`hex`()	Return a hexadecimal representation of a floating-point number.
`is_integer`()	Return True if the float is an integer.

Attributes

`imag`	the imaginary part of a complex number
`real`	the real part of a complex number
`auto_format`

as_integer_ratio()¶

Return integer ratio.

Return a pair of integers, whose ratio is exactly equal to the original float and with a positive denominator.

Raise OverflowError on infinities and a ValueError on NaNs.

>>> (10.0).as_integer_ratio()
(10, 1)
>>> (0.0).as_integer_ratio()
(0, 1)
>>> (-.25).as_integer_ratio()
(-1, 4)

fromhex()¶

Create a floating-point number from a hexadecimal string.

>>> float.fromhex('0x1.ffffp10')
2047.984375
>>> float.fromhex('-0x1p-1074')
-5e-324

hex()¶

Return a hexadecimal representation of a floating-point number.

>>> (-0.1).hex()
'-0x1.999999999999ap-4'
>>> 3.14159.hex()
'0x1.921f9f01b866ep+1'