Python (2) dictionary

One. The characteristics of the dictionary. ：

(1). The Python dictionary is unordered. (and the list is orderly) we can understand the dictionary as a set of key:value such a health value pair.

(2). The key of the Python dictionary is unique.

(3). Dictionaries can be nested in dictionaries, nested lists.

Eg: Define a dictionary. Perform basic operations on the dictionary.

1>>> dict = {2...' One':"1111",3...' Both':"2222",4...'three':"3333",5...'foure':"4444",6... }#Define a dictionary7>>>Print(dict)8{' Both':'2222','three':'3333','foure':'4444',' One':'1111'}9>>> doc2["fave"] ="5555"    #IncreaseTen>>>Dict One{' Both':'2222','three':'3333','foure':'4444',' One':'1111','fave':'5555'} A>>> Dict.pop (" One")#Pop function Delete - '1111' ->>>Dict the{' Both':'2222','three':'3333','foure':'4444','fave':'5555'} ->>>deldict[" Both"]#del Delete ->>>Dict -{'three':'3333','foure':'4444','fave':'5555'} +>>> doc2["fave"] ="5"  #Change ->>>Dict +{'three':'3333','foure':'4444','fave':'5'} A>>> Dict.get (" Four")     at>>> Dict.get ("foure")#Not present in the dictionary will not error, but return none - '4444' ->>> dict["foure"]#not exist in the dictionary will be an error - '4444' ->>>" Four" inchDict - False in>>>" Four"  not inchDict -True

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Python (2) dictionary