Assuming you have connected <connecting> to your site.
To get information about a file:
>>> file = site.images['Example.jpg']
where file is now an instance of Image <mwclient.image.Image> that you can query for various properties:
>>> file.imageinfo {'comment': 'Reverted to version as of 17:58, 12 March 2010', 'descriptionshorturl': 'https://commons.wikimedia.org/w/index.php?curid=6428847', 'descriptionurl': 'https://commons.wikimedia.org/wiki/File:Example.jpg', 'height': 178, 'metadata': [{'name': 'MEDIAWIKI_EXIF_VERSION', 'value': 1}], 'sha1': 'd01b79a6781c72ac9bfff93e5e2cfbeef4efc840', 'size': 9022, 'timestamp': '2010-03-14T17:20:20Z', 'url': 'https://upload.wikimedia.org/wikipedia/commons/a/a9/Example.jpg', 'user': 'SomeUser', 'width': 172}
You also have easy access to file usage:
>>> for page in image.imageusage(): >>> print('Page:', page.name, '; namespace:', page.namespace)
See the API reference <mwclient.image.Image> for more options.
Caution
Note that Image.exists refers to whether a file exists locally. If a file does not exist locally, but in a shared repo like Wikimedia Commons, it will return False.
To check if a file exists locally or in a shared repo, you could test if image.imageinfo != {}.
The Image.download() <mwclient.image.Image.download> method can be used to download the full size file. Pass it a file object and it will stream the image to it, avoiding the need for keeping the whole file in memory:
>>> file = site.images['Example.jpg'] >>> with open('Example.jpg', 'wb') as fd: ... image.download(fd)
>>> site.upload(open('file.jpg'), 'destination.jpg', 'Image description')