当通过for循环将字典追加到列表中时，我只得到最后一个字典

my_list = []
my_dict1 = {'key1': 'value1'}
my_dict2 = {'key2': 'value2'}
my_dict3 = {'key3': 'value3'}

my_list.append(my_dict1)
my_list.append(my_dict2)
my_list.append(my_dict3)

print(my_list)

my_list = []
my_dict1 = {'key1': 'value1'}
my_dict2 = {'key2': 'value2'}
my_dict3 = {'key3': 'value3'}

my_list.extend([my_dict1, my_dict2, my_dict3])

print(my_list)