deepcopy on dataset with private block fails

[kwijk]

Recursion in deep copy when running:

    ds = pydicom.data.get_testdata_file("MR_small.dcm", read=True)
    block = ds.private_block(0x000b, "My company 001", create=True)
    ds2 = copy.deepcopy(ds)

../venv/lib/python3.11/site-packages/pydicom/dataset.py:2803: in _copy_implementation
    copied.__dict__[k] = copy_function(v)
E   RecursionError: maximum recursion depth exceeded while calling a Python object

The reason for this recursion may be that class PrivateBlock has a reference to it parent dataset.

Your environment

module	version
platform	Linux-6.7.9-arch1-1-x86_64-with-glibc2.39
Python	3.11.8 (main, Feb 12 2024, 14:50:05) [GCC 13.2.1 20230801]
pydicom	2.4.4
gdcm	module not found
jpeg_ls	module not found
numpy	1.26.4
PIL	module not found
pylibjpeg	2.0.0
openjpeg	2.1.1
libjpeg	2.0.2

[scaramallion]

Thanks, it'll get fixed in the next release