You can use the command `pyreverse` which is included with the `pylint` package:

```shell
$ pip install pylint
$ pyreverse [options] <packages>
```

For example, this command will output a pdf class diagram called `classes.pdf` for a python package called `example`:

```shell
$ pyreverse -o pdf example
```

More documentation on `pyreverse` can be found here: https://pylint.readthedocs.io/en/latest/pyreverse.html
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