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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_init(self, filename="__init__.py"):
 """ Get various info from the package without importing them """

        import ast

        with open(filename) as init_file:
            module = ast.parse(init_file.read())

        itr = lambda x: (ast.literal_eval(node.value) for node in ast.walk(module) \
            if isinstance(node, ast.Assign) and node.targets[0].id == x)

        try:
            return next(itr("__author__")), \
                   next(itr("__email__")), \
                   next(itr("__license__")), \
                   next(itr("__version__"))
        except StopIteration:
            raise ValueError("One of author, email, license, or version"
                        " cannot be found in {}".format(filename))