Additions and deletions to change search the dictionary to learn

Dictionary: Dictionaries are unordered, no order. There is a list at the subject, all is in order

Composed of fields: key - value 

Dictionary Guming Si Yee, can store a lot of things, and through key can quickly query the corresponding value

Dictionary definitions

name ={

    name1 = "xiaohong",

    name2 = "xiaobai"

}

Method to query the value (this method can only query key already exists, if the key does not exist query will complain)

print(name[“name1”])

 

Optimized version of the query method

print (name.get (name3)) will return this time none

print (name.get (name2)) return this time "xiaobai"

 

 

See if the key already exists in the dictionary

print ( "name2" in name) exists, false return ture does not exist

 

Modify name1

name [name1] = "red"

 

 

New name3

name [name3] = "Li"

 

Delete name3

del name[name3]

Delete name dictionary table

del name

 

Another way to delete name3

name.pop("name3")

 

Random deleted

name.popitem()