Python basic data Type--dictionary

Dictionary

1. Variable sequence of "key-value" pairs,

2. ' Key ' can be any immutable sequence, such as Integer, real, plural, string, tuple, etc., do not allow repetition,' value ' can be repeated

3. You can use Globals () and locals () to view a dictionary of all global/local variables and values in the current scope

1 #Create a dictionary2>>keys = ['a','b','C']3>>values = [A]4>>adic =dict (Zip (keys,values))5>>Print(adict)6{'a': 1,'b': 2,'C': 3}7 8>>person = Dict (name='Jack', age=37)9>>Print(person)Ten{'name':'Jack',' Age': 37} One  A #Delete a dictionary or its elements ->>delperson[' Age'] ->>Print(person) the{'name':'Jack'} ->>person.pop ('name') - 'Jack' ->>Print(person) + {} -  + #use Clear () to empty the dictionary A>>person = Dict (name='Jack', age=37) at>>Print(person) -{'name':'Jack',' Age': 37} ->>person.clear () ->>Print(person) -{}

1 #Reading dictionary elements2>>adict = Dict (name='Nik', age=32,sex='Mans', work=False)3>>adict['name']4 'Nik'5>>adict.get (' Age')6327 8 #returns the key value pair9>>Adict.items ()TenDict_items ([('name','Nik'), (' Age', 32), ('Sex','Mans'), (' Work', False)]) One  A #return value ->>adict.values () -Dict_values (['Nik', 32,'Mans', False]) the  - #Return key ->>Adict.keys () -Dict_keys (['name',' Age','Sex',' Work'])

1 #Adding and modifying elements2>>perc = Dict (name='Nik', age=32,sex='Mans', work=False)3>>perc['Address'] ='WHT'4>>Print(ADITC)5{'Address':'WHT',' Age': 32,'name':'Nik','Sex':'Mans',' Work': False}6 7 #use Update to add all of the key value pairs of another dictionary to the current dictionary, adding from the header8>>perc.update ({'ID': 256,'Height': 175})9>>Print(PERC)Ten{'Address':'WHT',' Age': 32,'Height': 175,'ID': 256,'name':'Nik', One  'Sex':'Mans',' Work': False} A  - #generate 1000 random characters and count the occurrences of each character ->>Importstring the>>ImportRandom ->>x=string.ascii_letters+string.digits+string.punctuation ->>Print(x) - 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789! " #$%&\ ' () *+,-./:;<=>[email protected][\\]^_ ' {|} ~' +>>y=[random.choice (x) forIinchRange (1000)] ->>z ="'. Join (y) +>>d =dict () A>> forChinchZ: atD[ch] = D.get (ch,0) +1 ->>Print(d) - #more results, not listed -  - #Counter class statistic character count using collections module ->>ImportColllectionsImportCounter in>>freq =Counter (z) ->>Freq.items () to #the most frequently occurring +>>freq.most_common (1) -[('A', 18)] the #maximum number of times before 3 *>>freq.most_common (3) $[('A', 18), (')', 18), (':', 17)]

Python basic data Type--dictionary