Comments and exact indentation are preserved throughout the translation process.
By default, 2to3 runs a set of :ref:`predefined fixers <2to3-fixers>`. The
-:option:`-l` flag lists all available fixers. An explicit set of fixers to run
+:option:`!-l` flag lists all available fixers. An explicit set of fixers to run
can be given with :option:`-f`. Likewise the :option:`!-x` explicitly disables a
fixer. The following example runs only the ``imports`` and ``has_key`` fixers::