循环遍历字典的1+3级

my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}

# 遍历字典的键
for key in my_dict:
    print(key)

key1
key2
key3

my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}

# 遍历字典的值
for value in my_dict.values():
    print(value)

value1
value2
value3

my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}

# 遍历字典的键值对
for key, value in my_dict.items():
    print(key, value)

key1 value1
key2 value2
key3 value3

my_dict = {"key1": "value1", "key2": "value2", "key3": "value3"}

# 3级循环遍历字典
for key1 in my_dict:
    for key2 in my_dict:
        print(key1, key2, my_dict[key2])

key1 key1 value1
key1 key2 value2
key1 key3 value3
key2 key1 value1
key2 key2 value2
key2 key3 value3
key3 key1 value1
key3 key2 value2
key3 key3 value3