# pydicom.tag.BaseTag

class pydicom.tag.BaseTag

  Represents a DICOM element (group, element) tag.

  Tags are represented as an `int`.

  __init__()

  Methods

  `__init__`() |
  `as_integer_ratio`() | Return a pair of integers, whose ratio is equal to the original int.
  `bit_count`() | Number of ones in the binary representation of the absolute value of self.
  `bit_length`() | Number of bits necessary to represent self in binary.
  `conjugate`() | Returns self, the complex conjugate of any int.
  `from_bytes`(bytes[, byteorder, signed]) | Return the integer represented by the given array of bytes.
  `is_integer`() | Returns True.
  `to_bytes`([length, byteorder, signed]) | Return an array of bytes representing an integer.

  Attributes

  `denominator` | the denominator of a rational number in lowest terms
  `elem` | Return the tag's element number as `int`.
  `element` | Return the tag's element number as `int`.
  `group` | Return the tag's group number as `int`.
  `imag` | the imaginary part of a complex number
  `is_private` | Return `True` if the tag is private (has an odd group number).
  `is_private_creator` | Return `True` if the tag is a private creator.
  `json_key` | Return the tag value as a JSON key string 'GGGGEEEE'.
  `numerator` | the numerator of a rational number in lowest terms
  `private_creator` | Return the private creator tag for the given tag.
  `real` | the real part of a complex number

  as_integer_ratio()

    Return a pair of integers, whose ratio is equal to the original int.

    The ratio is in lowest terms and has a positive denominator.

        >>> (10).as_integer_ratio()
        (10, 1)
        >>> (-10).as_integer_ratio()
        (-10, 1)
        >>> (0).as_integer_ratio()
        (0, 1)

  bit_count()

    Number of ones in the binary representation of the absolute value of self.

    Also known as the population count.

        >>> bin(13)
        '0b1101'
        >>> (13).bit_count()
        3

  bit_length()

    Number of bits necessary to represent self in binary.

        >>> bin(37)
        '0b100101'
        >>> (37).bit_length()
        6

  conjugate()

    Returns self, the complex conjugate of any int.

  denominator

    the denominator of a rational number in lowest terms

  property elem: int

    Return the tag’s element number as `int`.

  property element: int

    Return the tag’s element number as `int`.

  classmethod from_bytes(bytes, byteorder='big', *, signed=False)

    Return the integer represented by the given array of bytes.

    bytes

      Holds the array of bytes to convert. The argument must either support the buffer protocol or be an iterable object producing bytes. Bytes and bytearray are examples of built-in objects that support the buffer protocol.

    byteorder

      The byte order used to represent the integer. If byteorder is ‘big’, the most significant byte is at the beginning of the byte array. If byteorder is ‘little’, the most significant byte is at the end of the byte array. To request the native byte order of the host system, use sys.byteorder as the byte order value. Default is to use ‘big’.

    signed

      Indicates whether two’s complement is used to represent the integer.

  property group: int

    Return the tag’s group number as `int`.

  imag

    the imaginary part of a complex number

  is_integer()

    Returns True. Exists for duck type compatibility with float.is_integer.

  property is_private: bool

    Return `True` if the tag is private (has an odd group number).

  property is_private_creator: bool

    Return `True` if the tag is a private creator.

  property json_key: str

    Return the tag value as a JSON key string ‘GGGGEEEE’.

  numerator

    the numerator of a rational number in lowest terms

  property private_creator: BaseTag

    Return the private creator tag for the given tag. The result is meaningless if this is not a private tag.

    Added in version 2.4.

  real

    the real part of a complex number

  to_bytes(length=1, byteorder='big', *, signed=False)

    Return an array of bytes representing an integer.

    length

      Length of bytes object to use. An OverflowError is raised if the integer is not representable with the given number of bytes. Default is length 1.

    byteorder

      The byte order used to represent the integer. If byteorder is ‘big’, the most significant byte is at the beginning of the byte array. If byteorder is ‘little’, the most significant byte is at the end of the byte array. To request the native byte order of the host system, use sys.byteorder as the byte order value. Default is to use ‘big’.

    signed

      Determines whether two’s complement is used to represent the integer. If signed is False and a negative integer is given, an OverflowError is raised.