"Python"--Dictionary

# "dictionary"    #映射    #字典是无序存储的, no positional relationship    print (ID (a))   #打印a的内存地址    #不可变类型: Integer, String, tuple    #可变类型: list, dictionary Dictionary = {' name ': ' Zhangw ', ' age ': +, ' isboy ': True,} dictionary2 = {' name ': ' Haha ', ' What ': ' Qie '}    #字典可以做值, cannot do key # Dictionary name {key: Value, key: Value} #字典两大特点            #无序    #键唯一    #增加    dictionary[' name '] =    dictionary[' haha ') = ' new '    ret= Dictionary.setdefault (' age ', +) #键存在, does not change, returns the corresponding value in the dictionary, the key does not exist, adds a new key-value pair in the dictionary, and returns the corresponding value    #查找        #通过键        Print ( dictionary[' name '])        print (Dictionary.keys ()) #查找键            #查找出来的是dict_key类型        print (Dictionary.values ())        print (Dictionary.items ())     #修改        dictionary.update (dictionary2)    #删除        del dictionary[' name '] #根据键删除        dictionary.clear () #清空字典        del.dictionary #删除整个字典 #排序         sorted (dictionary)

"Python"--Dictionary