如何在函数中访问字典？

def process_dict(my_dict):
    # 访问字典中的值
    value = my_dict['key']
    # 修改字典中的值
    my_dict['key'] = new_value
    # 添加新的键值对
    my_dict['new_key'] = new_value

# 调用函数并传递字典作为参数
my_dict = {'key': 'value'}
process_dict(my_dict)

my_dict = {'key': 'value'}

def process_dict():
    global my_dict
    # 访问字典中的值
    value = my_dict['key']
    # 修改字典中的值
    my_dict['key'] = new_value
    # 添加新的键值对
    my_dict['new_key'] = new_value

process_dict()

def create_dict():
    my_dict = {'key': 'value'}
    return my_dict

# 调用函数并接收返回的字典
result_dict = create_dict()
# 访问字典中的值
value = result_dict['key']