4.2：

~~~if  else语句

~~~range函数

无法正常输出

~~~len ,  zip

my_list = ['apple', 'banana', 'cherry']
indices = range(len(my_list))for index, value in zip(indices, my_list):print(f"Index: {index}, Value: {value}")

~~~enumerate

animals = ["dog", "cat", "mouse"]
for i, value in enumerate(animals):print(i, value)
i是索引，value是值，和js不一样