# Version 2.0.0

## Changelog

- Dropped support for Python 2 (only Python 3.5+ supported)

- Changes to Dataset.file_meta

  - file_meta now shown by default in dataset str or repr output; `pydicom.config.show_file_meta` can be set `False` to restore previous behavior

  - new `FileMetaDataset` class that accepts only group 2 data elements

  - Deprecation warning given unless Dataset.file_meta set with a `FileMetaDataset` object (in pydicom 3, it will be required)

- Old PersonName class removed; PersonName3 renamed to PersonName. Classes PersonNameUnicode and PersonName3 are aliased to PersonName but are deprecated and will be removed in version 2.1

- `dataelem.isMultiValue` (previously deprecated) has been removed. Use `dataelem.DataElement.VM` instead.

### Enhancements

- Allow PathLike objects for filename argument in dcmread, dcmwrite and Dataset.save_as (#1047)

- Deflate post-file meta information data when writing a dataset with the Deflated Explicit VR Little Endian transfer syntax UID (#1086)

- Added config.replace_un_with_known_vr to be able to switch off automatic VR conversion for known tags with VR “UN” (see #1067)

- Added config.use_DS_numpy and config.use_IS_numpy to have multi-valued data elements with VR of DS or IS return a numpy array (#623) (much faster for bigger arrays). Both default to False to preserve previous behavior

### Fixes

- Fixed reading of datasets with an empty Specific Character Set tag (regression, #1038)

- Fixed failure to parse dataset with an empty LUT Descriptor or Red/Green/Blue Palette Color LUT Descriptor element. (#1049)

- Made Dataset.save_as a wrapper for dcmwrite (#1042) rather than having different checks in each

- Removed `1.2.840.10008.1.2.4.70` - JPEG Lossless (Process 14, SV1) from the Pillow pixel data handler as Pillow doesn’t support JPEG Lossless. (#1053)

- Fixed error when writing elements with a VR of OF (#1075)

- Fixed improper conversion when reading elements with a VR of OF (#1075)

- Fixed `apply_voi_lut()` and `apply_modality_lut()` not handling (0028,3006) LUT Data with a VR of OW (#1073)

- Fixed access to private creator tag in raw datasets (#1078)

- Fixed description of newly added known private tag (#1082)

- Fixed update of private blocks after deleting private creator (#1097)

- Fixed bug in updating pydicom.config.use_DS_Decimal flag in `DS_decimal()`