human
Solve the following python programming problem given the following code:
def get_hierarchy(self, loc_types) : 
    '
        Return loc types in order from parents to children
        ' 
    lt_dict = { lt ['pk'] : lt for lt in loc_types } 
    for loc_type in loc_types : 
        visited = set () 
        def step(lt) : 
            assert (lt ['name'] not in visited), "There's a loc type cycle, we need to prohibit that" 
            visited.add (lt ['name']) 
            if lt ['parent_type'] : 
                step (lt_dict [lt ['parent_type']]) 
step (loc_type) 
hierarchy = { 
        
} 
    def insert_loc_type(loc_type) : 
        "
            Get parent location's hierarchy, insert loc_type into it,
            and return hierarchy below loc_type
            " 
        name = loc_type ['name'] 
        parent = lt_dict.get (loc_type ['parent_type'], None) 
        if (not parent) : 
            lt_hierarchy = hierarchy 
else : 
            lt_hierarchy = insert_loc_type (parent) 
if (name not in lt_hierarchy) : 
            lt_hierarchy [name] = (loc_type, { 
                
}) 
return lt_hierarchy [name] [1] 
for loc_type in loc_types : 
        insert_loc_type (hierarchy) 
ordered_loc_types = [] 
    def step_through_graph(hierarchy) : 
        for (name, (loc_type, children)) in hierarchy.items () : 
            ordered_loc_types.append (loc_type) 
            step_through_graph (children) 
step_through_graph (hierarchy) 
    return ordered_loc_types 

    
    

    Fix the buggy line: insert_loc_type (hierarchy)
assistant
#Here is Python program to fix the buggy line: insert_loc_type (hierarchy)
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insert_loc_type (loc_type)