append("张三") #不允许添加:tuple' object has no attribute 'append' tu[0] = "日元" #不允许修改 :object does not support item assignment del tu[2] #报错,不允许删除:'tuple' object doesn't support item deletion print(tu[2]) #索引就可以 #欧元 #关于元组不可变的注意点...
也可以使用tuple()创建一个元组: 不指定参数时,返回一个空元组 使用tuple作为参数时,返回该参数的浅拷贝 其他参数时,尝试将给定的对象转换为tuple类型 1.1.2 元组索引和分片 代码语言:javascript 代码运行次数:0 运行 AI代码解释 tup=('first',5,'white','dog')print(tup[1])print(tup[-2])print(tup[1:...
Remember that the first item has index 0.By leaving out the start value, the range will start at the first item:Example This example returns the items from the beginning to, but NOT included, "kiwi": thistuple = ("apple", "banana", "cherry", "orange", "kiwi", "melon", "mango")...
#create a tuple tuplex= tuple("index tuple") print(tuplex) #getindex of the first item whose valueispassedasparameter index= tuplex.index("p") print(index)#definethe index from which you want to searchindex= tuplex.index("p",5) print(index)#definethe segment of the tuple to be search...
ExampleGet your own Python Server Create a Tuple: thistuple = ("apple","banana","cherry") print(thistuple) Try it Yourself » Tuple Items Tuple items are ordered, unchangeable, and allow duplicate values. Tuple items are indexed, the first item has index[0], the second item has index...
我们使用put()函数添加元素到哈希表,并使用get()函数检索。首先,我们将看一下put()函数的实现。我们首先将键和值嵌入到HashItem类中,并计算键的哈希: def put(self, key, value): item = HashItem(key, value) h = self._hash(key) 现在我们需要找到一个空槽。我们从与键的哈希值对应的槽开始。如果...
| T.index(value, [start, [stop]]) -> integer -- return first index of value. | Raises ValueError if the value is not present. list和index方法的使用和list一模一样。 命名元组 Python有一个类似tuple的容器namedtuples(命名元组),位于collection模块中。namedtuple是继承自tuple的子类,可创建一个和tup...
(t2, type(t2)) # (1, 10.31, 'python') <class 'tuple'> tuple1 = (1, 2, 3, 4, 5, 6, 7, 8) print(tuple1[1]) # 2 print(tuple1[5:]) # (6, 7, 8) print(tuple1[:5]) # (1, 2, 3, 4, 5) tuple2 = tuple1[:] print(tuple2) # (1, 2, 3, 4, 5, 6, 7...
item assignment 系统会报错,元组中的元素值不支持修改。 元组内置函数 元组和列表样,都有一些内置函数方便编程。例如: lentuple):计算元组元素个数。 max(tuple):返回元组中元素的大值 min(tuple):返回元组中元素的最值。 tuple(seq):将列表转换为元组。 元组中的元素是不能改变的,它也没有append)...
参数v的可能取值为*lists,也就是 tuple 的一个元素。 lambda函数返回值,等于lambda v冒号后表达式的返回值。 四、 数据结构 29 转为字典 创建数据字典 In [1]: dict() Out[1]: {} In [2]: dict(a='a',b='b') Out[2]: {'a': 'a', 'b': 'b'} In [3]: dict(zip(['a','b'],[...