Several data structures in the Python collection module (Counter, Ordereddict, Namedtup)

There are several data structures in the collection module that we might be able to use.

Counter is a subclass of the dictionary that is responsible for counting a dictionary, supporting + addition-subtraction & seeking Common Elements | Seek and set

Print (' Counter type application ') c = Counter ("Dengjingdong") #c = Counter ({' n ': 3, ' G ': 3, ' d ': 2, ' I ': 1, ' O ': 1, ' E ': 1, ' J ': 1}) Prin T ("raw Data:", c) print ("Up to two elements:", C.most_common (2)) #输出数量最多的元素print ("Number of D:", c[' d ')) #输出d的个数print (C.values ()) # The value list of the output dictionary, print (SUM (c.values ())) #输出总字符数print (sorted (c.elements ())) #将字典中的数据, sort print by dictionary order (' \ n ') "" #删除所有d元素del c[' d '] b = Counter ("Dengxiaoxiao") #通过subtract函数删除元素, the number of elements can become negative. C.subtract (b) "" "" "" can add data B = Counter ("Qinghuabeida") C.update (b) "" "

The ordereddict type is an ordered dictionary, which is actually a more sequential order than a normal dictionary.

Print (' ordereddict type of application ') dic = {}dic[' a '] = ' a ' dic[' b '] = ' B ' dic[' c '] = ' c ' odic = ordereddict () odic[' a '] = ' a ' odic[' b '] = ' B ' odic[' c '] = ' C ' Print (' Unordered dictionary: ', dic) print (' Ordered dictionary: ', odic) print (' \ n ')

Namedtup type, a dictionary-like tuple that can be converted to a dictionary

Print (' Namedtup type application ') Deng = namedtuple (' Deng ', [' X ', ' y ']) i = Deng (x = 11,y = y) print (' I's value: ', i) print (' Add two values: ', i[0]+i [1]) Print (' Add by attribute: ', i.x+i.y) m,n = iprint (' Assignment to tuple: ', m,n) ' d = i._asdict () print (' Convert to a dictionary: ', D)

Several data structures in the Python collection module (Counter, Ordereddict, Namedtup)