dictionary comprehension python 3

‘‘‘1. Access, modify, delete the values in the dictionary:‘‘‘Dict={' a ': ' One ', ' B ': ' A ', ' C ': ' + ', ' d ': ' 44 '}Print dict[' A '],dict[' d '] #访问dict[' B ']= ' abc ' #修改Print Dict#删除Del dict[' C '] #删除字典中的某个值Print DictDict.clear () #清空字典Print DictDel dict #删除字典---------------------------------------------11 44{' A ': ' One ', ' C ': ' + ', ' B ': ' abc ', ' d ': ' 44 '}{'

1 #-*-coding:utf-8-*-2 3 #1. Dictionaries4Dict = {'name':'Zara',' Age': 7,'class':' First'}5 6 #dictionary converted to string, return: : ' First '}7 Printtype (str (dict)), str (dict)8 9 #dictionaries can be converted to tuples, returning: (' age ', ' name ', ' class ')Ten Printtuple (dict) One #dictionaries can be converted to tuples, returning: (7, ' Zara ', ' first ') A Printtuple (Dict.values ()) - -

1 #-*-coding:utf-8-*-2 3 #1. Dictionaries4Dict = {'name':'Zara',' Age': 7,'class':' First'}5 6 #dictionary converted to string, return: : ' First '}7 Printtype (str (dict)), str (dict)8 9 #dictionaries can be converted to tuples, returning: (' age ', ' name ', ' class ')Ten Printtuple (dict) One #dictionaries can be converted to tuples, returning: (7, ' Zara ', ' first ') A Printtuple (Dict.values ()) - -

This article mainly introduces the use of the dictionary in Python to deal with index statistics, the use of the dictionary is the basic knowledge of Python learning, this article is related to a small practice, the need for friends can refer to the Recently toss index engine and data statistics work more, and the

Use the clear () method for dictionary operations in Python This article describes how to use the clear () method for dictionary operations in Python. It is the basic knowledge for getting started with Python. For more information, see The clear () method deletes all items i

The dictionary is the only type of mapping in Python. Dictionaries are mutable, unordered, variable-sized key-value mappings, sometimes called hash lists or associative arrays.Examples are below: DiC = {"Apple": 2, "orange":1} #定义一个字典 >>> dic.copy () #复制字典 {' Orange ': 1, ' Apple ': 2} >>> dic["banana"] = 5 #增加一项 >>> dic.items () #获得字典中成员的列表 [(' Orange ', 1), (' Apple ', 2), (' Banana ', 5)] >>> di

Use the fromkeys () method for dictionary operations in Python This article mainly introduces how to use the fromkeys () method for dictionary operations in Python. It is the basic knowledge for getting started with Python. For more information, see The fromkeys () method se

Pythondictionary (Dictionary)A dictionary is a mutable container model and can store any type of object.Each key value key=>value pairs, with colons : Split Each key-value pair is separated by a comma,The entire dictionary is included in curly braces {}, and the format is as follows:D = {key1:value1, key2:value2}Create>>>dict = {' A ': 1, ' B ': 2, ' B ': '

1.clearThe clear method clears all items in the dictionary. No return valueD = {'age''name':'Gumby'} D.clear ()>>> D{}2.copyThe Copy method returns a new dictionary with the same key-value pairsD = {'age''name' 'Gumby' = d.copy ()>>> b{' Age ':, ' name ': ' Gumby '}3.fromkeysThe Fromkeys method creates a new dictionary