Tuple解构特性对于函数返回多值是非常有意义的。 collections.namedtuple具名元组 附带提提collections.namedtuple,一个工厂函数,其在官方文档中的定义是: factory function for creating tuple subclasses with named fields. Returns a new tuple subclass
factory function for creating tuple subclasses with named fields. Returns a new tuple subclass named typename. The new subclass is used to create tuple-like objects that have fields accessible by attribute lookup as well as being indexable and iterable... In [57]: from collections import namedtup...
学到这里应该会想到列表和字符串有很多的共同属性,像索引和切片,它们都是序列数据类型的两个基本组成,这里再来学习一种序列数据类型——元组(tuple)。 元组的基本操作 创建元组 Python中,元组(tuple)用一对小括号()表示,元组内的各元素以逗号分隔。 t = () print(type(t)) # <type 'tuple'> t1 = ('name...
a number based on the object's value. The hash of an object must remain the same for the lifetime of the object, so it only makes sense for an object to be hashable if its value is immutable
defmultiply(a,b):returna*bmultiply(5,4)20 下面是另一个根据单词长度进行相关计算的示例。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 defis_long(word):iflen(word)>8:returnf"{word} is a long word."is_long("artificial")'artificial is a long word.' ...
All of Python’s immutable built-in objects are hashable(tuple等), while no mutable containers (such as lists or dictionaries) are. Objects which are instances of user-defined classes are hashable by default; they all compare unequal (except with themselves), and their hash value is theirid(...
a = [1, 2, 3, 456, 789, 1234.5] del a[0] #[2, 3, 456, 789, 1234.5] del a[2:4] #[2, 3, 1234.5] del a[:] 也可以用 del 删除实体变量: 代码语言:python 代码运行次数:0 运行 AI代码解释 del a 7.元组 Python3的数据结构 | 元组(Tuple) 元组由若干逗号分隔的值组成,例如: 代码...
我们知道在Python中list确实是可以塞下多个不同类型元素的，而tuple似乎仅仅是个immutable且hashable的list...
self.hash_tables[i].setdefault(key, []).append(tuple(inputs_one)) def query(self, inputs, nums=20): """ 查询与inputs相似的向量,并输出相似度最高的nums个 :param inputs: 输入向量 :param nums: :return: """ hash_val = self._hash(inputs).ravel() ...
使用等价的 if-elif 链来定义 switch 语句（可能会做些优化）同上，另外所有表达式都必须是可哈希的（hashable）看作是预先计算的字典的分派（dispatch）PEP 中这部分的内容非常多，因为在每个思路上，Guido 还考虑到了好几种实现路径，这导致了他在复杂分析后的结论是：It is too early to decide（ 现在做决定为...