Magic two Python dictionary

# Dictionary 
#dict 

#. 1 according to a sequence, to create the dictionary, and assign a uniform value 

# 2 acquired according to the key value, when the key does not exist, you can specify a default value (None)

 V = dict. Fromkeys ([ "K1", "123" , "999"], 123) 
Print (V) 

DIC = { 
    "K1": "V1", 
    "K2": "V2", 
    "K3": "V3" 
} 

. V = DIC GET ( "K1") 
Print (V) 

#. 3 deleted to obtain the value
 V = DIC. POP ( "K1") 
Print (DIC, V) 

# randomly deleted
 K, V = DIC. popitem () 
Print (DIC, K, V) 

#. 4 set value 
# of exists, is not provided, the corresponding key retrieves the current value of 
# is not present, set, get the current key value corresponding to
 V = DIC. setDefault ( "K4", "123")
print(dic,v)

#5更新
dic.update({"k1":"1111","k3":123})
Print (DIC) 

dic.update (K1 = 123, 123 = K2, K3 = 123) 
Print (DIC) 

# dictionary common method
 #keys () values () items ( ) get () update ()