chore: import upstream snapshot with attribution

samples/python/README.md

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+General Setup Guide for Samples
+==============================
+
+
+## Download Sample Data
+
+Install the tool dependencies via `python3 -m pip install -r requirements.txt`.
+
+Invoke [downloader.py](downloader.py) to download the data with
+a command like the one below if `download.yml` is present in the
+sample directory ([example](onnx_packnet/download.yml)).
+
+```sh
+downloader.py -d /path/to/data/dir -f /path/to/download.yml
+```
+
+The data directory i.e. `/path/to/data/dir` is a centralized directory
+to store data of all samples. So you can use same one for all samples.
+It can be provided by either `-d /path/to/data/dir` or the environment variable
+`$TRT_DATA_DIR`, where the `-d` has higher priority.
+
+Remember to use `-d` or `$TRT_DATA_DIR` when running sample scripts
+that rely on downloaded data. Scripts will abort if no downloaded data
+is found in data directory. (`$TRT_DATA_DIR` will be much simplier.)
+An error will be thrown if the data is not properly setup.
+
+The `download.yml` file is owned by the sample which describes the sample
+name, the path, URL and checksum of the data files that are required by the sample.
+
+
+**Notes for sample developers**
+
+To use the downloaded data files, integrate the code segment like below into
+the sample code, and obtain the path to the data file by passing the `path`
+as specified in the associated `download.yml` file of the sample.
+
+```py
+TRT_DATA_DIR = None
+
+def getFilePath(path):
+    global TRT_DATA_DIR
+    if not TRT_DATA_DIR:
+        parser = argparse.ArgumentParser(description="Convert PackNet to ONNX")
+        parser.add_argument('-d', '--data', help="Specify the data directory where it is saved in. $TRT_DATA_DIR will be overwritten by this argument.")
+        args, _ = parser.parse_known_args()
+        TRT_DATA_DIR = os.environ.get('TRT_DATA_DIR', None) if args.data is None else args.data
+    if TRT_DATA_DIR is None:
+        raise ValueError("Data directory must be specified by either `-d $DATA` or environment variable $TRT_DATA_DIR.")
+
+    fullpath = os.path.join(TRT_DATA_DIR, path)
+    if not os.path.exists(fullpath):
+        raise ValueError("Data file %s doesn't exist!" % fullpath)
+
+    return fullpath
+```
+
+**Python Version Support**
+
+All Python samples are expected to be run with Python>=3.10. It is not recommended to use any lower version as there may be compatibility issues.
+
+# Changelog
+
+August 2025
+Removed support for Python versions < 3.10.