human
Solve the following python programming problem given the following code:
def __init__(self, connection) : 
    super (PostGISOperations, self).__init__ (connection) 
    prefix = self.geom_func_prefix 
    self.geometry_operators = { 
        'overlaps_left' : PostGISOperator ('&<'), 
        'overlaps_right' : PostGISOperator ('&>'), 
        'left' : PostGISOperator ('<<'), 
        'right' : PostGISOperator ('>>'), 
        'overlaps_below' : PostGISOperator ('&<|'), 
        'overlaps_above' : PostGISOperator ('|&>'), 
        'strictly_below' : PostGISOperator ('<<|'), 
        'strictly_above' : PostGISOperator ('|>>'), 
        'same_as' : PostGISOperator ('~='), 
        'exact' : PostGISOperator ('~='), 
        'contained' : PostGISOperator ('@'), 
        'bbcontains' : PostGISOperator ('~'), 
        'bboverlaps' : PostGISOperator ('&&'), 
} 
    self.geometry_functions = { 
        'equals' : PostGISFunction (prefix, 'Equals'), 
        'disjoint' : PostGISFunction (prefix, 'Disjoint'), 
        'touches' : PostGISFunction (prefix, 'Touches'), 
        'crosses' : PostGISFunction (prefix, 'Crosses'), 
        'within' : PostGISFunction (prefix, 'Within'), 
        'overlaps' : PostGISFunction (prefix, 'Overlaps'), 
        'contains' : PostGISFunction (prefix, 'Contains'), 
        'intersects' : PostGISFunction (prefix, 'Intersects'), 
        'relate' : (PostGISRelate, six.string_types), 
        'coveredby' : PostGISFunction (prefix, 'CoveredBy'), 
        'covers' : PostGISFunction (prefix, 'Covers'), 
} 
    dtypes = ((Decimal, Distance, float) + six.integer_types) 
    def get_dist_ops(operator) : 
        'Returns operations for both regular and spherical distances.' 
        return { 
            'cartesian' : PostGISDistance (prefix, operator), 
            'sphere' : PostGISSphereDistance (prefix, operator), 
            'spheroid' : PostGISSpheroidDistance (prefix, operator), 
} 
self.distance_functions = { 
        'distance_gt' : (get_dist_ops ('>'), dtypes), 
        'distance_gte' : (get_dist_ops ('>='), dtypes), 
        'distance_lt' : (get_dist_ops...

    
    

    Fix the buggy line: self.mem_size = (connection + 'mem_size')
assistant
#Here is Python program to fix the buggy line: self.

self.mem_size = (prefix + 'mem_size')