# 基本写法
user = {'name': 'Alice', 'age': 25, 'city': 'Beijing'}
<h1>空字典</h1><p>empty_dict = {}</p>

# 使用关键字参数
user = dict(name='Alice', age=25, city='Beijing')
<h1>使用键值对序列（如列表或元组）</h1><p>user = dict([('name', 'Alice'), ('age', 25), ('city', 'Beijing')])</p>
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                <h1>从两个列表构建</h1><p>keys = ['name', 'age', 'city']
values = ['Alice', 25, 'Beijing']
user = dict(zip(keys, values))</p>

# 示例：创建平方映射
squares = {x: x**2 for x in range(1, 6)}
# 结果: {1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
<h1>带条件的推导式</h1><p>even_squares = {x: x**2 for x in range(1, 11) if x % 2 == 0}</p>