How to use the unittest2.util.safe_repr function in unittest2

(default 7) and comparing to zero, or by comparing that the
           between the two objects is less than the given delta.

           Note that decimal places (from zero) are usually not the same
           as significant digits (measured from the most signficant digit).

           Objects that are equal automatically fail.
        """
        if delta is not None and places is not None:
            raise TypeError("specify delta or places not both")
        if delta is not None:
            if not (first == second) and abs(first - second) > delta:
                return
            standardMsg = '%s == %s within %s delta' % (safe_repr(first),
                                                        safe_repr(second),
                                                        safe_repr(delta))
        else:
            if places is None:
                places = 7
            if not (first == second) and round(
                    abs(second - first), places) != 0:
                return
            standardMsg = '%s == %s within %r places' % (safe_repr(first),
                                                         safe_repr(second),
                                                         places)

        msg = self._formatMessage(msg, standardMsg)
        raise self.failureException(msg)

def assertDictContainsSubset(self, expected, actual, msg=None):
        """Checks whether actual is a superset of expected."""
        missing = []
        mismatched = []
        for key, value in expected.iteritems():
            if key not in actual:
                missing.append(key)
            else:
                try:
                    are_equal = (value == actual[key])
                except UnicodeDecodeError:
                    are_equal = False
                if not are_equal:
                    mismatched.append('%s, expected: %s, actual: %s' %
                                      (safe_repr(key), safe_repr(value), 
                                       safe_repr(actual[key])))

        if not (missing or mismatched):
            return

        standardMsg = ''
        if missing:
            standardMsg = 'Missing: %s' % ','.join([safe_repr(m) for m in 
                                                    missing])
        if mismatched:
            if standardMsg:
                standardMsg += '; '
            standardMsg += 'Mismatched values: %s' % ','.join(mismatched)

        self.fail(self._formatMessage(msg, standardMsg))

Objects that are equal automatically fail.
        """
        if delta is not None and places is not None:
            raise TypeError("specify delta or places not both")
        if delta is not None:
            if not (first == second) and abs(first - second) > delta:
                return
            standardMsg = '%s == %s within %s delta' % (safe_repr(first), 
                                                        safe_repr(second),
                                                        safe_repr(delta))
        else:
            if places is None:
                places = 7
            if not (first == second) and round(abs(second-first), places) != 0:
                return
            standardMsg = '%s == %s within %r places' % (safe_repr(first), 
                                                         safe_repr(second),
                                                         places)

        msg = self._formatMessage(msg, standardMsg)
        raise self.failureException(msg)

def assertDictContainsSubset(self, expected, actual, msg=None):
        """Checks whether actual is a superset of expected."""
        missing = []
        mismatched = []
        for key, value in expected.items():
            if key not in actual:
                missing.append(key)
            elif value != actual[key]:
                mismatched.append('%s, expected: %s, actual: %s' %
                                  (safe_repr(key), safe_repr(value),
                                   safe_repr(actual[key])))

        if not (missing or mismatched):
            return

        standardMsg = ''
        if missing:
            standardMsg = 'Missing: %s' % ','.join(safe_repr(m) for m in
                                                    missing)
        if mismatched:
            if standardMsg:
                standardMsg += '; '
            standardMsg += 'Mismatched values: %s' % ','.join(mismatched)

        self.fail(self._formatMessage(msg, standardMsg))

def assertGreaterEqual(self, a, b, msg=None):
        """Just like self.assertTrue(a >= b), but with a nicer default message."""
        if not a >= b:
            standardMsg = '%s not greater than or equal to %s' % (
                safe_repr(a), safe_repr(b))
            self.fail(self._formatMessage(msg, standardMsg))

For the purposes of this function, a valid ordered sequence type is one
        which can be indexed, has a length, and has an equality operator.

        Args:
            seq1: The first sequence to compare.
            seq2: The second sequence to compare.
            seq_type: The expected datatype of the sequences, or None if no
                    datatype should be enforced.
            msg: Optional message to use on failure instead of a list of
                    differences.
        """
        if seq_type is not None:
            seq_type_name = seq_type.__name__
            if not isinstance(seq1, seq_type):
                raise self.failureException('First sequence is not a %s: %s'
                                            % (seq_type_name, safe_repr(seq1)))
            if not isinstance(seq2, seq_type):
                raise self.failureException('Second sequence is not a %s: %s'
                                            % (seq_type_name, safe_repr(seq2)))
        else:
            seq_type_name = "sequence"

        differing = None
        try:
            len1 = len(seq1)
        except (TypeError, NotImplementedError):
            differing = 'First %s has no length.    Non-sequence?' % (
                    seq_type_name)

        if differing is None:
            try:
                len2 = len(seq2)

def assertNotIn(self, member, container, msg=None):
        """Just like self.assertTrue(a not in b), but with a nicer default message."""
        if member in container:
            standardMsg = '%s unexpectedly found in %s' % (safe_repr(member), 
                                                            safe_repr(container))
            self.fail(self._formatMessage(msg, standardMsg))

difference rounded to the given number of decimal places
           (default 7) and comparing to zero, or by comparing that the
           between the two objects is less than the given delta.

           Note that decimal places (from zero) are usually not the same
           as significant digits (measured from the most signficant digit).

           Objects that are equal automatically fail.
        """
        if delta is not None and places is not None:
            raise TypeError("specify delta or places not both")
        if delta is not None:
            if not (first == second) and abs(first - second) > delta:
                return
            standardMsg = '%s == %s within %s delta' % (safe_repr(first),
                                                        safe_repr(second),
                                                        safe_repr(delta))
        else:
            if places is None:
                places = 7
            if not (first == second) and round(
                    abs(second - first), places) != 0:
                return
            standardMsg = '%s == %s within %r places' % (safe_repr(first),
                                                         safe_repr(second),
                                                         places)

        msg = self._formatMessage(msg, standardMsg)
        raise self.failureException(msg)

def assertNotIn(self, member, container, msg=None):
        """Just like self.assertTrue(a not in b), but with a nicer default message."""
        if member in container:
            standardMsg = '%s unexpectedly found in %s' % (safe_repr(member), 
                                                            safe_repr(container))
            self.fail(self._formatMessage(msg, standardMsg))