如何复制和操作字典？

original_dict = {'a': 1, 'b': [2, 3]}
shallow_copy_dict = original_dict.copy()

import copy

original_dict = {'a': 1, 'b': [2, 3]}
deep_copy_dict = copy.deepcopy(original_dict)

my_dict = {'a': 1, 'b': 2}
my_dict['c'] = 3  # 添加新的键值对
my_dict['a'] = 4  # 修改现有的键值对

my_dict = {'a': 1, 'b': 2, 'c': 3}
del my_dict['b']  # 删除指定的键值对

my_dict = {'a': 1, 'b': 2, 'c': 3}
value = my_dict['a']  # 访问指定的键值对

my_dict = {'a': 1, 'b': 2, 'c': 3}
if 'a' in my_dict:
    print("Key 'a' exists")

import copy

original_dict = {'a': 1, 'b': [2, 3]}
deep_copy_dict = copy.deepcopy(original_dict)
deep_copy_dict['b'].append(4)  # 修改深拷贝的字典不会影响原字典

my_dict = {'a': 1, 'b': 2}
value = my_dict.get('c', 0)  # 如果键不存在，返回默认值 0