PYTHON-10 Dictionary

#1 Create

dict1={' Huan Huan ': ' I love ', ' small high ': ' You '}

Dict2={1: ' One ', 2: ' Both ', 3: ' Three '}

dict3={}

#2 Access elements

Print (' Huanhuan: ', dict1[' Huan Huan ')

　　Huan Huan: I love

Print (dict2[1])

　　One

Print (DICT3)

　　{}

#3 dict (Create Dictionary), key (gets all the keys in the specified dictionary), values (gets all the values in the specified dictionary), items (gets all the items in the specified dictionary: key + value)

Dict4=dict ((' A ', +), (' B ', ())) #创建1

Print (DICT4)

　　{' A ': +, ' B ': 66}

Dict5=dict (a=65,b=66) #创建2

Print (DICT5)

　　{' A ': +, ' B ': 66}

Dict6=dict.fromkeys ((), ' I love ') #创建3
Print (DICT6)

　　{1: ' I Love ', 2: ' I love '}

Dict7=dict.fromkeys (Range (32), ' Huan Huan ')

For I in Dict7.keys (): #获取指定字典中所有的键
Print (i)
For I in Dict7.values (): #获取指定字典中所有的值
Print (i)
For I in Dict7.items (): #获取指定字典中所有的项: Key + value
Print (i)

#4 Get, SetDefault

Print (Dict7.get (32, ' none ')) #查找指定字典中键为32所对应的值 (returns ' None ' if no key 32)
Print (Dict7.setdefault) #查找指定字典中键为33所对应的值 (automatically add key 33 and its value ' 33 ' if no key 32)

#5 Pre-copy: Copy empty dictionary: Clear

Dict8=dict7

Dict9=dict7.copy ()

Print (ID (DICT7))
Print (ID (DICT8))
Print (ID (DICT9))

　　54405320
54405320
49806392

Dict7.clear () #清空字典

#6 Pop, Popitem, update

Print (Dict7.pop (1)) #弹出指定键对应的值
Print (Dict7.popitem ()) #随机弹出一项: Key + value

Dict10={1:11}
Dict7.update (dict10) #利用字典dict10更新其他字典dict7

PYTHON-10 Dictionary