Little script to add date caption to photos from their EXIF data.
## Notes on Exif data
There is [ExifRead](https://github.com/ianare/exif-py) or [Exif](https://exif.readthedocs.io/en/latest/index.html) which can also modify exif data (and is tested and documented).
Both seem to be alive but `ExifRead` should suffice.
```python
with open(file, 'rb') as f:
# Don’t process makernote tags, don’t extract the thumbnail image (if any)
tags = exif.process_file(f, details=False)
for tag in tags.keys():
if tag not in ('JPEGThumbnail', 'TIFFThumbnail', 'Filename', 'EXIF MakerNote'):
```
Interesting keys (to be completed by further observations):
