aram local_only: If True (default), only return installations
local to the current virtualenv, if in a virtualenv.
:param skip: An iterable of canonicalized project names to ignore;
    defaults to ``stdlib_pkgs``.
:param include_editables: If False, don't report editables.
:param editables_only: If True, only report editables.
:param user_only: If True, only report installations in the user
site directory.
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