如何从特定键获取值

# 字典示例
my_dict = {'key1': 'value1', 'key2': 'value2'}
if 'key1' in my_dict:
    value = my_dict['key1']
    print(value)
else:
    print('Key not found')

# 数组示例
my_list = ['value1', 'value2', 'value3']
if len(my_list) > 2:
    value = my_list[2]
    print(value)
else:
    print('Index out of range')

// 对象示例
var my_obj = {key1: 'value1', key2: 'value2'};
if ('key1' in my_obj) {
    var value = my_obj['key1'];
    console.log(value);
} else {
    console.log('Key not found');
}

// 数组示例
var my_array = ['value1', 'value2', 'value3'];
if (my_array.length > 2) {
    var value = my_array[2];
    console.log(value);
} else {
    console.log('Index out of range');
}