如何从comboBox中删除重复项

from tkinter import ttk

def remove_duplicates(combo):
    items = combo['values']
    unique_items = []
    
    for item in items:
        if item not in unique_items:
            unique_items.append(item)
    
    combo['values'] = unique_items

# 创建一个示例的comboBox
combo = ttk.Combobox()
combo['values'] = ['Apple', 'Banana', 'Apple', 'Orange', 'Banana']

# 打印原始的comboBox项
print('原始项:', combo['values'])

# 删除重复项
remove_duplicates(combo)

# 打印删除重复项后的comboBox项
print('删除重复项后:', combo['values'])

原始项: ('Apple', 'Banana', 'Apple', 'Orange', 'Banana')
删除重复项后: ('Apple', 'Banana', 'Orange')