Dictionaries in python

Python Dictionary

A dictionary is key-value pair in python.

The elements in dictionary is enclosed in flower brackets,

my_dict={"name":"srinidhi",

                 "rank":5,

                 "country":"India",

                 "fav_counties":["Japan","South Korea","London"]}

name, rank, country, fav_counties are keys.

The keys can be of any immutable data type.

The values can be of any data type.

 

How to get value of a particular key?

To get the value of a certain key, use value() method.

my_dict.value(name)

"srinidhi" 

Methods in dictionary

• items()
• keys()
• values()
• clear()
• get()

1. items() method is used to get all the elements in the dictionary.

my_dict.items()

(name:"srinidhi")

(rank:5)

(country:"India")

(fav_counties:["Japan","South Korea","London"]) 

Here the output will be tuples.

Get the separate key value pair by unpacking the tuples.

for key,value in my_dict:

        print(key,"= ",value) 

name= "srinidhi"

rank= 5

country= "India"

fav_counties:= ["Japan","South Korea","London"]

 

2. keys() method returns all the keys in the dictionary.

3. values() method returns all the values in the dictionary

4. get()   returns none if key is absent in dictionary.

my_dict.get(age) does not throw error. it returns none.

 

5. clear()  method is used to delete the entire elements in dictionary.

my_dict.clear()

print(my_dict)

{}