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/usr/share/pyshared/unittest2/util.py is in python-unittest2 0.5.1-1.

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"""Various utility functions."""

__unittest = True


_MAX_LENGTH = 80
def safe_repr(obj, short=False):
    try:
        result = repr(obj)
    except Exception:
        result = object.__repr__(obj)
    if not short or len(result) < _MAX_LENGTH:
        return result
    return result[:_MAX_LENGTH] + ' [truncated]...'

def safe_str(obj):
    try:
        return str(obj)
    except Exception:
        return object.__str__(obj)

def strclass(cls):
    return "%s.%s" % (cls.__module__, cls.__name__)

def sorted_list_difference(expected, actual):
    """Finds elements in only one or the other of two, sorted input lists.

    Returns a two-element tuple of lists.    The first list contains those
    elements in the "expected" list but not in the "actual" list, and the
    second contains those elements in the "actual" list but not in the
    "expected" list.    Duplicate elements in either input list are ignored.
    """
    i = j = 0
    missing = []
    unexpected = []
    while True:
        try:
            e = expected[i]
            a = actual[j]
            if e < a:
                missing.append(e)
                i += 1
                while expected[i] == e:
                    i += 1
            elif e > a:
                unexpected.append(a)
                j += 1
                while actual[j] == a:
                    j += 1
            else:
                i += 1
                try:
                    while expected[i] == e:
                        i += 1
                finally:
                    j += 1
                    while actual[j] == a:
                        j += 1
        except IndexError:
            missing.extend(expected[i:])
            unexpected.extend(actual[j:])
            break
    return missing, unexpected

def unorderable_list_difference(expected, actual, ignore_duplicate=False):
    """Same behavior as sorted_list_difference but
    for lists of unorderable items (like dicts).

    As it does a linear search per item (remove) it
    has O(n*n) performance.
    """
    missing = []
    unexpected = []
    while expected:
        item = expected.pop()
        try:
            actual.remove(item)
        except ValueError:
            missing.append(item)
        if ignore_duplicate:
            for lst in expected, actual:
                try:
                    while True:
                        lst.remove(item)
                except ValueError:
                    pass
    if ignore_duplicate:
        while actual:
            item = actual.pop()
            unexpected.append(item)
            try:
                while True:
                    actual.remove(item)
            except ValueError:
                pass
        return missing, unexpected

    # anything left in actual is unexpected
    return missing, actual