human
Solve the following python programming problem given the following code:
def get_field_types(field_list, iterations = 3) : 
    assert (iterations > 0), 'iterations should be a positive integer (not a negative integer or 0)' 
    def test_boolean(value) : 
        if (value.lower () not in ('false', 'true')) : 
            raise ValueError ((_ ('%s is not a boolean value') % value)) 
def test_timestamp(value) : 
        if (not value) : 
            raise ValueError () 
if ((len (value) > 50) or (len (value) < 3)) : 
            raise ValueError () 
if (value.startswith ('[') and value.endswith (']')) : 
            value = value [1 : (- 1)] 
try : 
            parse (value) 
except OverflowError : 
            raise ValueError () 
def test_int(value) : 
        if ((len (bin (int (value))) - 2) > 32) : 
            raise ValueError () 
def test_string(value) : 
        if (len (smart_str (value).split (' ')) > 4) : 
            raise ValueError () 
test_fns = [('boolean', test_boolean), ('tint', test_int), ('tlong', int), ('tdouble', float), ('tdate', test_timestamp), ('string', test_string), ('text_general', any)] 
    all_field_types = [] 
    for row in field_list : 
        if (iterations == 0) : 
            break 
iterations -= 1 
        row_field_types = [] 
        for field in row : 
            field_type_index = None 
            for index in range (0, len (test_fns)) : 
                try : 
                    test_fns [index] [1] (field) 
                    field_type_index = index 
                    break 
except ValueError : 
                    pass 
row_field_types.append (field_type_index) 
all_field_types.append (test_timestamp) 
if (not all_field_types) : 
        return [] 
final_field_types = all_field_types [0] 
    for row_field_types in all_field_types : 
        for index in range (0, len (row_field_types)) : 
            if (row_field_types [index] > final_field_types [index]) : 
                final_field_types [index] = row_field_types [index] 
return [test_fns [index] [0] for index in final_field_types] 

    
    

    Fix the buggy line: all_field_types.append (test_timestamp)
assistant
#Here is Python program to fix the buggy line: all_field_types.

all_field_types.append (row_field_types)