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    @raise ModuleNotFound: If the name is syntactically correct but the
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    @raise ObjectNotFound: If the name is syntactically correct, includes at
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    unless you already know that the filename you're talking about is a Python
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    @param fn: A filesystem path to a module or package; C{bytes} on Python 2,
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    (XXX: If "highest" means "closest to the starting class".)

    Ex::

      class Soy:
        properties = {"taste": "bland"}

      class Plant:
        properties = {"colour": "green"}

      class Seaweed(Plant):
        pass

      class Lunch(Soy, Seaweed):
        properties = {"vegan": 1 }

      dct = {}

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    C{start} and C{goal}.

    Since this can be slightly difficult to visualize, here's an example::

        >>> class Holder:
        ...     def __init__(self, x):
        ...         self.x = x
        ...
        >>> start = Holder({"irrelevant": "ignore",
        ...                 "relevant": [7, 1, 3, 5, 7]})
        >>> for path in objgrep(start, 7):
        ...     print("start" + path)
        start.x['relevant'][0]
        start.x['relevant'][4]

    This can be useful, for example, when debugging stateful graphs of objects
    attached to a socket, trying to figure out where a particular connection is
    attached.

    @param start: The object to start looking at.

    @param goal: The object to search for.

    @param eq: A 2-argument predicate which takes an object found by traversing
        references starting at C{start}, as well as C{goal}, and returns a
        boolean.

    @param path: The prefix of the path to include in every return value; empty
        by default.

    @param paths: The result object to append values to; a list of strings.

    @param seen: A dictionary mapping ints (object IDs) to objects already
        seen.

    @param showUnknowns: if true, print a message to C{stdout} when
        encountering objects that C{objgrep} does not know how to traverse.

    @param maxDepth: The maximum number of object references to attempt
        traversing before giving up.  If an integer, limit to that many links,
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