摘要:
```cpp animals = ["aardvark", "badger", "duck", "emu", "fennec fox"] print(animals[1:3]) # print "badger" and "duck" duck_index = animals.index("duck") # Use index() to find "duck" animals.in... 阅读全文
摘要:
```cpp # str = "AbCd" #以下示例均使用该字符串 截取: print(str[1:3]) #输出"bC" 转小写: print(str.lower()) #输出"abcd" 转大写: print(str.upper()) #输出"ABCD" 长度: print(len(str)) #输出4 选择满足某些条件的值
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