[Python] Code block partially highlighted in Sphinx

In my Sphinx documentation I have the following code-block:

.. code-block:: python

import logging
logging.getLogger('mymodule').setLevel(logging.INFO)


but when the documentation is rendered the code is only partially highlighted:



Is it possible to highlight also the other parts? The only (related) settings I am using in conf.py is pygments_style = 'default'.

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