How to use the pydicom.filebase.DicomBytesIO function in pydicom

Parameters
        ----------
        elem : pydicom.dataelem.DataElement
            The element to encode
        is_implicit_VR : bool
            Encode using implicit VR, default True
        is_little_endian : bool
            Encode using little endian, default True

        Returns
        -------
        str or bytes
            The encoded element as str (python2) or bytes (python3)
        """
        with DicomBytesIO() as fp:
            fp.is_implicit_VR = is_implicit_VR
            fp.is_little_endian = is_little_endian
            write_data_element(fp, elem)
            return fp.parent.getvalue()

def compare_logfile_within_zip(zip_filepath):
    with open(zip_filepath, 'rb') as input_file:
        data = io.BytesIO(input_file.read())

    data_zip = zipfile.ZipFile(data)

    namelist = data_zip.namelist()
    dicom_files = [path for path in namelist if path.endswith('.dcm')]

    assert len(dicom_files) == 1
    dicom_file = dicom_files[0]

    with data_zip.open(dicom_file) as file_object:
        dcm_bytes = DicomBytesIO(file_object.read())
        dcm = pydicom.dcmread(dcm_bytes)

    MUDensity.from_dicom(dcm)

def setUp(self):
        # Create a dummy (in memory) file to write to
        self.f1 = DicomBytesIO()
        self.f1.is_little_endian = True
        self.f1.is_implicit_VR = True

def setUp(self):
        """Create an empty file-like for use in testing."""
        self.fp = DicomBytesIO()
        self.fp.is_little_endian = True
        self.fp.is_implicit_VR = True

def test_equal():
    dicom1 = DicomBase.from_dict(
        {"Manufacturer": "PyMedPhys", "PatientName": "Python^Monte"}
    )
    dicom2 = DicomBase.from_dict(
        {"Manufacturer": "PyMedPhys", "PatientName": "Python^Monte"}
    )
    assert dicom1 == dicom2  # Equality from dict

    try:
        fp1 = pydicom.filebase.DicomBytesIO()
        dicom1.to_file(fp1)
        fp2 = pydicom.filebase.DicomBytesIO()
        dicom2.to_file(fp2)

        dicom1_from_file = DicomBase.from_file(fp1)
        dicom2_from_file = DicomBase.from_file(fp2)
        # Equality from file (implicitly also from dataset)
        assert dicom1_from_file == dicom2_from_file

        dicom1_from_file.dataset.PatientName = "test^PatientName change"
        assert dicom1_from_file != dicom2_from_file  # Negative case

        dicom1_from_file.dataset.PatientName = "Python^Monte"
        assert dicom1_from_file == dicom2_from_file  # Equality post re-assignment

        dicom1_from_file_copied = deepcopy(dicom1_from_file)
        assert dicom1_from_file == dicom1_from_file_copied  # Equality from deepcopy
    finally:

def convert_dicom_to_jpg(name):
    try:
        data = f.read(name)
        dirtype = 'train' if 'train' in name else 'test'
        imgnm = (name.split('/')[-1]).replace('.dcm', '')
        dicom = pydicom.dcmread(DicomBytesIO(data))
        image = dicom.pixel_array
        image = rescale_image(image, rescaledict['RescaleSlope'][imgnm], rescaledict['RescaleIntercept'][imgnm])
        image = apply_window_policy(image)
        image -= image.min((0,1))
        image = (255*image).astype(np.uint8)
        cv2.imwrite(os.path.join(path_proc, dirtype, imgnm)+'.jpg', image)
    except:
        print(name)

The dataset to encode
    is_implicit_vr : bool
        The element encoding scheme the dataset will be encoded with, ``True``
        for implicit VR, ``False`` for explicit VR.
    is_little_endian : bool
        The byte ordering the dataset will be encoded in, ``True`` for little
        endian, ``False`` for big endian.

    Returns
    -------
    bytes or None
        The encoded dataset as :class:`bytes` (if successful) or ``None`` if
        the encoding failed.
    """
    # pylint: disable=broad-except
    fp = DicomBytesIO()
    fp.is_implicit_VR = is_implicit_vr
    fp.is_little_endian = is_little_endian
    try:
        write_dataset(fp, ds)
    except Exception as ex:
        LOGGER.error("pydicom.write_dataset() failed:")
        LOGGER.error(ex)
        fp.close()
        return None

    bytestring = fp.parent.getvalue()
    fp.close()

    return bytestring

def encode_element(elem, is_implicit_VR, is_little_endian):
    """Encode a pydicom DataElement to a byte stream."""
    fp = DicomBytesIO()
    fp.is_implicit_VR = is_implicit_VR
    fp.is_little_endian = is_little_endian
    write_data_element(fp, elem)
    rawstr = fp.parent.getvalue()
    fp.close()

    return rawstr

def write_data_element(fp, data_element, encodings=None):
    """Write the data_element to file fp according to
    dicom media storage rules.
    """
    # Write element's tag
    fp.write_tag(data_element.tag)

    # write into a buffer to avoid seeking back which can be expansive
    buffer = DicomBytesIO()
    buffer.is_little_endian = fp.is_little_endian
    buffer.is_implicit_VR = fp.is_implicit_VR

    VR = data_element.VR
    if not fp.is_implicit_VR and len(VR) != 2:
        msg = ("Cannot write ambiguous VR of '{}' for data element with "
               "tag {}.\nSet the correct VR before writing, or use an "
               "implicit VR transfer syntax".format(
                   VR, repr(data_element.tag)))
        raise ValueError(msg)

    if data_element.is_raw:
        # raw data element values can be written as they are
        buffer.write(data_element.value)
        is_undefined_length = data_element.length == 0xFFFFFFFF
    else:

If `enforce_standard` is ``True`` and any of the required *File Meta
        Information* elements are missing from `file_meta`, with the
        exception of (0002,0000), (0002,0001) and (0002,0012).
    ValueError
        If any non-Group 2 Elements are present in `file_meta`.
    """
    validate_file_meta(file_meta, enforce_standard)

    if enforce_standard and 'FileMetaInformationGroupLength' not in file_meta:
        # Will be updated with the actual length later
        file_meta.FileMetaInformationGroupLength = 0

    # Write the File Meta Information Group elements
    # first write into a buffer to avoid seeking back, that can be
    # expansive and is not allowed if writing into a zip file
    buffer = DicomBytesIO()
    buffer.is_little_endian = True
    buffer.is_implicit_VR = False
    write_dataset(buffer, file_meta)

    # If FileMetaInformationGroupLength is present it will be the first written
    #   element and we must update its value to the correct length.
    if 'FileMetaInformationGroupLength' in file_meta:
        # Update the FileMetaInformationGroupLength value, which is the number
        #   of bytes from the end of the FileMetaInformationGroupLength element
        #   to the end of all the File Meta Information elements.
        # FileMetaInformationGroupLength has a VR of 'UL' and so has a value
        #   that is 4 bytes fixed. The total length of when encoded as
        #   Explicit VR must therefore be 12 bytes.
        file_meta.FileMetaInformationGroupLength = buffer.tell() - 12
        buffer.seek(0)
        write_data_element(buffer, file_meta[0x00020000])