set# A set is an unordered collection of unique elements. You can think of them like dicts, but keys only, no values. 基本操作如下图: List, Set and Dict Comprehensions# list comprehension:[expr for val in collection if condition] dict comprehension:{key-expr : value-expr for value in c...
无序(unordered) 唯一(unique) 由于set 存储的是无序集合,所以没法通过索引来访问,但是可以判断一个元素是否在集合中。 B[1] 1. --- TypeError Traceback (most recent call last) <ipython-input-93-ee721d8948fe> in <module> ---> 1 B[1] TypeError: 'set' object does not support indexing 1....
<class 'set'> Traceback (most recent call last) <ipython-input-5-9605bb6fbc68> in <module> 4 5 #Creating a set which holds mutable elements ---> 6 set2 = {1,2,3,["Javatpoint",4]} 7 print(type(set2)) TypeError: unhashable type: 'list' In the above code, we have created...
A set is an unordered collection with no duplicate elements. set 是一种无序的集合,集合里的元素不能重复 集合的特点: 互异性 无序性 :没有索引 确定性 在python 中,列表,字典不可放入到集合中 创建集合:创建空集合不能用{} ,要用set() ,{}会创建一个空字典 #创建集合 set1=set() #创建空集合 ...
empty = [] print(empty, type(empty)) # [] <class 'list'> 1.3向列表中添加元素 list.append(obj)在列表末尾添加新的对象,只接受一个参数,参数可以是任何数据类型,被追加的元素在 list 中保持着原结构类型。 x = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'] x.append('Thursday')...
set(iterable) -> new set object Build an unordered collection of unique elements. # (copied from class doc)"""passdef__ior__(self, *args, **kwargs):#real signature unknown"""Return self|=value."""passdef__isub__(self, *args, **kwargs):#real signature unknown"""Return self-=val...
In these examples, you create different tuples using the tuple() constructor, which accepts any type of iterable object.Note: The tuple constructor also accepts sets. However, remember that sets are unordered data structures. This characteristic will affect the final order of items in the ...
TypeError: unsupported operand type(s) for +: 'set' and 'set' In [86]: s1 | s2 #并集重载的运算符是| Out[86]: {1, 2, 3, 4} 集合相关的判断 issuperset,issubset isdisjoint:判断是否两个集合是否不相交(disjoint),有交集则返回False,没有交集则返回True ...
Python’s built-in set data type is a mutable and unordered collection of unique and hashable elements. In this definition, the qualifiers mean the following:Mutable: You can add or remove elements from an existing set. Unordered: A set doesn’t maintain any particular order of its elements....
---> 1 s1 = set(1) TypeError:'int'objectisnotiterable 传递一个非迭代器参数时会报错。 创建空集合 set() -> new emptysetobject 通过上面的例子,可见set类型数据和dict类型一样也是使用{}来标识,但是需要注意的是:dict类型可以使用dic = {}来创建一个空字典,set类型却不能,只能通过s = set()来创建...