human
Solve the following python programming problem given the following code:
def _history_mapper(local_mapper) : 
    cls = local_mapper.class_ 
    for prop in local_mapper.iterate_properties : 
        getattr (local_mapper.class_, prop.key).impl.active_history = True 
super_mapper = local_mapper.inherits 
    super_history_mapper = getattr (cls, '__history_mapper__', None) 
    polymorphic_on = None 
    super_fks = [] 
    def _col_copy(col) : 
        orig = col 
        col = col.copy () 
        orig.info ['history_copy'] = col 
        col.unique = False 
        col.default = col.server_default = None 
        return col 
properties = util.OrderedDict () 
    if ((not super_mapper) or (local_mapper.local_table is not super_mapper.local_table)) : 
        cols = [] 
        version_meta = { 
            'version_meta' : True, 
} 
        for column in local_mapper.local_table.c : 
            if _is_versioning_col (column) : 
                continue 
col = _col_copy (column) 
            if (super_mapper and col_references_table (column, super_mapper.local_table)) : 
                super_fks.append ((col.key, list (super_history_mapper.local_table.primary_key) [0])) 
cols.append (col) 
            if (column is local_mapper.polymorphic_on) : 
                polymorphic_on = col 
orig_prop = local_mapper.get_property_by_column (column) 
            if ((len (orig_prop.columns) > 1) or (orig_prop.columns [0].key != orig_prop.key)) : 
                properties [orig_prop.key] = tuple ((col.info ['history_copy'] for col in orig_prop.columns)) 
if super_mapper : 
            super_fks.append (('version', super_history_mapper.local_table.c.version)) 
cols.append (Column ('version', Integer, primary_key = True, autoincrement = False, info = version_meta)) 
        cols.append (Column ('changed', DateTime, default = datetime.datetime.utcnow, info = version_meta)) 
        if super_fks : 
            cols.append (ForeignKeyConstraint (* zip (* super_fks))) 
table = Table ((local_mapper.local_table.name + '_history'), local_mapper.local_table.metadata, * cols, schema =...

    
    

    Fix the buggy line: versioned_cls = type.__new__ (type, ('%sHistory' % super_history_mapper.__name__), bases, {
assistant
#Here is Python program to fix the buggy line: versioned_cls = type.

versioned_cls = type.__new__ (type, ('%sHistory' % cls.__name__), bases, {