python中的for的变量序列

for variable in sequence:
    # 执行语句

# 遍历列表
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

# 遍历字符串
for letter in "python":
    print(letter)

# 遍历字典
person = {"name": "Alice", "age": 30}
for key, value in person.items():
    print(key, value)

# 获取键
for key in person:
    print(key)

# 获取值
for value in person.values():
    print(value)

# 获取键值对
for key, value in person.items():
    print(key, value)

# 创建一个新的列表来存储修改后的元素
new_list = []
for item in original_list:
    if item % 2 == 0:
        new_list.append(item * 2)
    else:
        new_list.append(item)