>>> name = 'Zophie a cat' >>> name[7] = 'the' Traceback (most recent call last): File "<pyshell#50>", line 1, in <module> name[7] = 'the' TypeError: 'str' object does not support item assignment “改变”一个字符串的正确方法是使用切片和连接,通过复制旧字符串的一部分来构建...
self.items.append(item)def__iter__(self):#yield from self.itemsreturniter(self.items)def__getitem__(self, index):#索引访问returnself.items[index]def__setitem__(self, key, value):#索引赋值self.items[key] =valuedef__str__(self):returnstr(self.items)def__add__(self, other):#+self....
2, 3, 4] for item in my_list: print(item)循环（Loop）：循环可分为for循环和while循环。...
Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'tuple' object does not support item assignment >>> 1. 2. 3. 4. 5. 6. 7. 8. 9. 元组由`()`表示,当只有一个元素是,后边要跟`,`括号也可以省虐不写。 AI检测代码解析 >>> t = 1, >>> type(...
只需要查看是否实现了__call__特殊方法。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 >>> def is_callable(item): ... return hasattr(item, '__call__') ... >>> is_callable(list) True >>> def function(): ... pass ... >>> is_callable(function) True >>> class MyClass: ...
'lst' as a parameterdefrandom_element(lst):# Use the 'choice' function to return a random element from the input list 'lst'returnchoice(lst)# Call the 'random_element' function with a list as an argument and print the randomly selected elementprint(random_element([2,3,4,7,9,11,15]...
items from index 5 to last print("my_list[5: ] =", my_list[5: ]) # get a list from the first item to index -5 print("my_list[: -4] =", my_list[: -4]) # omitting both start and end index # get a list from start to end items print("my_list[:] =", my_list[:...
return self.__dict__[item] def __setitem__(self, key, value): self.__dict__[key]=value def __delitem__(self, key): print('del obj[key]时,我执行') self.__dict__.pop(key) f = Foo('alex') # f.name = ... print(f['name']) # f.__getitem__('name') f['age'] ...
:returnself.data[index]def__setitem__(self,index,value):self.data[index]=valuedef__delitem__...
06.>>> el = [] # Create an empty list 07.>>> len(el) 08.0 09.>>> sl = [1] # Create a single item list 10.>>> len(sl) 11.1• 3.直接创建 list 对象,将序列直接传递给构造函数,还可以将拥有元组或字符串的变量传递给 list 构造函数 ...