How to use the pympler.util.stringutils.trunc function in Pympler

def _get_graphviz_data(self):
        """
        Emit a graph representing the connections between the objects described
        within the metadata list. The text representation can be transformed to
        a graph with graphviz. Returns a string.
        """
        s = []
        header = '// Process this file with graphviz\n'
        s.append( header)
        s.append('digraph G {\n')
        s.append('    node [shape=box];\n')
        for md in self.metadata:
            label = trunc(md.str, 48).replace('"', "'")
            extra = ''
            if md.type == 'instancemethod':
                extra = ', color=red'
            elif md.type == 'frame':
                extra = ', color=orange'
            s.append('    "X%s" [ label = "%s\\n%s" %s ];\n' % \
                (hex(md.id)[1:], label, md.type, extra))
        for e in self.edges:
            extra = ''
            if e.label == '__dict__':
                extra = ',weight=100'
            s.append('    X%s -> X%s [label="%s"%s];\n' % \
                (hex(e.src)[1:], hex(e.dst)[1:], e.label, extra))

        s.append('}\n')
        return "".join(s)

def print_object(self, tobj):
        """
        Print the gathered information of object `tobj` in human-readable format.
        """
        if tobj.death:
            self.stream.write('%-32s ( free )   %-35s\n' % (
                trunc(tobj.name, 32, left=1), trunc(tobj.repr, 35)))
        else:
            self.stream.write('%-32s 0x%08x %-35s\n' % (
                trunc(tobj.name, 32, left=1),
                tobj.id,
                trunc(tobj.repr, 35)
            ))
        if tobj.trace:
            self.stream.write(_format_trace(tobj.trace))
        for (timestamp, size) in tobj.snapshots:
            self.stream.write('  %-30s %s\n' % (
                pp_timestamp(timestamp), pp(size.size)
            ))
            self._print_refs(size.refs, size.size)
        if tobj.death is not None:
            self.stream.write('  %-30s finalize\n' % (
                pp_timestamp(tobj.death),
            ))

fobj = self.stream

        fobj.write('---- SUMMARY '+'-'*66+'\n')
        for snapshot in self.snapshots:
            self.annotate_snapshot(snapshot)
            fobj.write('%-35s %11s %12s %12s %5s\n' % (
                trunc(snapshot.desc, 35),
                'active',
                pp(snapshot.asizeof_total),
                'average',
                'pct'
            ))
            for classname in classlist:
                info = snapshot.classes.get(classname)
                fobj.write('  %-33s %11d %12s %12s %4d%%\n' % (
                    trunc(classname, 33),
                    info['active'],
                    pp(info['sum']),
                    pp(info['avg']),
                    info['pct']
                ))
        fobj.write('-'*79+'\n')

def print_object(self, tobj):
        """
        Print the gathered information of object `tobj` in human-readable format.
        """
        if tobj.death:
            self.stream.write('%-32s ( free )   %-35s\n' % (
                trunc(tobj.name, 32, left=1), trunc(tobj.repr, 35)))
        else:
            self.stream.write('%-32s 0x%08x %-35s\n' % (
                trunc(tobj.name, 32, left=1),
                tobj.id,
                trunc(tobj.repr, 35)
            ))
        if tobj.trace:
            self.stream.write(_format_trace(tobj.trace))
        for (timestamp, size) in tobj.snapshots:
            self.stream.write('  %-30s %s\n' % (
                pp_timestamp(timestamp), pp(size.size)
            ))
            self._print_refs(size.refs, size.size)
        if tobj.death is not None:
            self.stream.write('  %-30s finalize\n' % (
                pp_timestamp(tobj.death),
            ))

def print_object(self, tobj):
        """
        Print the gathered information of object `tobj` in human-readable
        format.
        """
        if tobj.death:
            self.stream.write('%-32s ( free )   %-35s\n' % (
                trunc(tobj.name, 32, left=1), trunc(tobj.repr, 35)))
        else:
            self.stream.write('%-32s 0x%08x %-35s\n' % (
                trunc(tobj.name, 32, left=1),
                tobj.id,
                trunc(tobj.repr, 35)
            ))
        if tobj.trace:
            self.stream.write(_format_trace(tobj.trace))
        for (timestamp, size) in tobj.snapshots:
            self.stream.write('  %-30s %s\n' % (
                pp_timestamp(timestamp), pp(size.size)
            ))
            self._print_refs(size.refs, size.size)
        if tobj.death is not None:
            self.stream.write('  %-30s finalize\n' % (
                pp_timestamp(tobj.death),

def print_stats(self, stream=None):
        """
        Log annotated garbage objects to console or file.

        :param stream: open file, uses sys.stdout if not given
        """
        if not stream: # pragma: no cover
            stream = sys.stdout
        self.metadata.sort(key=lambda x: -x.size)
        stream.write('%-10s %8s %-12s %-46s\n' % ('id', 'size', 'type', 'representation'))
        for g in self.metadata:
            stream.write('0x%08x %8d %-12s %-46s\n' % (g.id, g.size, trunc(g.type, 12),
                trunc(g.str, 46)))
        stream.write('Garbage: %8d collected objects (%s in cycles): %12s\n' % \
            (self.count, self.num_in_cycles, pp(self.total_size)))

def print_summary(self):
        """
        Print per-class summary for each snapshot.
        """
        # Emit class summaries for each snapshot
        classlist = self.tracked_classes

        fobj = self.stream

        fobj.write('---- SUMMARY ' + '-' * 66 + '\n')
        for snapshot in self.snapshots:
            self.annotate_snapshot(snapshot)
            fobj.write('%-35s %11s %12s %12s %5s\n' % (
                trunc(snapshot.desc, 35),
                'active',
                pp(snapshot.asizeof_total),
                'average',
                'pct'
            ))
            for classname in classlist:
                info = snapshot.classes.get(classname)
                fobj.write('  %-33s %11d %12s %12s %4d%%\n' % (
                    trunc(classname, 33),
                    info['active'],
                    pp(info['sum']),
                    pp(info['avg']),
                    info['pct']
                ))
        fobj.write('-' * 79 + '\n')

def print_stats(self, stream=None):
        """
        Log annotated garbage objects to console or file.

        :param stream: open file, uses sys.stdout if not given
        """
        if not stream:  # pragma: no cover
            stream = sys.stdout
        self.metadata.sort(key=lambda x: -x.size)
        stream.write('%-10s %8s %-12s %-46s\n' % ('id', 'size', 'type',
                                                  'representation'))
        for g in self.metadata:
            stream.write('0x%08x %8d %-12s %-46s\n' % (g.id, g.size,
                                                       trunc(g.type, 12),
                                                       trunc(g.str, 46)))
        stream.write('Garbage: %8d collected objects (%s in cycles): %12s\n' %
                     (self.count, self.num_in_cycles, pp(self.total_size)))

def _print_refs(self, fobj, refs, total, level=1, minsize=0, minpct=0.1):
        """
        Print individual referents recursively.
        """
        lrefs = list(refs)
        lrefs.sort(key=lambda x: x.size)
        lrefs.reverse()
        if level == 1:
            fobj.write('\n')
        for ref in lrefs:
            if ref.size > minsize and (ref.size * 100.0 / total) > minpct:
                data = dict(level=level,
                            name=trunc(str(ref.name), 128),
                            size=pp(ref.size),
                            pct=ref.size * 100.0 / total)
                fobj.write(self.refrow % data)
                self._print_refs(fobj, ref.refs, total, level=level + 1)
        if level == 1:
            fobj.write("<table></table>\n")