使用循环遍历字典

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

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

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

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

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

# 创建字典的迭代器
iter_dict = iter(my_dict)

# 遍历字典的键
while True:
    try:
        key = next(iter_dict)
        print(key)
    except StopIteration:
        break

# 遍历字典的值
iter_values = iter(my_dict.values())
while True:
    try:
        value = next(iter_values)
        print(value)
    except StopIteration:
        break

# 遍历字典的键值对
iter_items = iter(my_dict.items())
while True:
    try:
        key, value = next(iter_items)
        print(key, value)
    except StopIteration:
        break