human
Solve the following python programming problem given the following code:
def delete_top_level(self, context = None) : 
    "
        Delete the top level calls which are not part of the user's code.

        TODO: If CELL_MAGIC then also merge the entries for the cell (which are
        seperated by line into individual code objects...)
        " 
    if (context == 'LINE_MAGIC') : 
        new_roots = [] 
        for function in self.cprofile_tree : 
            try : 
                if (function.co_name == '<module>') : 
                    new_roots += self.cprofile_tree [function] ['calls'] 
except AttributeError : 
                pass 
new_roots = [r for r in new_roots if ((type (r) == str) or (r.co_name != '<module>'))] 
        for i in range (len (new_roots)) : 
            function = r [i] 
            try : 
                if (function.co_name == '<module>') : 
                    del new_roots [i] 
except AttributeError : 
                pass 
if (context == 'CELL_MAGIC') : 
        new_roots = [] 
        for function in self.cprofile_tree : 
            try : 
                if ('<ipython-input' in function.co_filename) : 
                    new_roots += self.cprofile_tree [function] ['calls'] 
except AttributeError : 
                pass 
new_cprofile_tree = { 
        
} 
    def populate_new_tree(roots) : 
        for root in roots : 
            if (root not in new_cprofile_tree) : 
                new_cprofile_tree [root] = self.cprofile_tree [root] 
                populate_new_tree (self.cprofile_tree [root] ['calls']) 
populate_new_tree (new_roots) 
    self.cprofile_tree = new_cprofile_tree 
    self.roots = new_roots 

    
    

    Fix the buggy line: function = r [i]
assistant
#Here is Python program to fix the buggy line: function = r [i]
.

function = new_roots [i]