this_dict = {}

print(this_dict)

## {}

print(type(this_dict))

## class 'dict'

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(type(this_dict))

## class 'dict'
 

a = dict()

print(a)

## {}

print(type(a))

## class 'dict'
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(type(this_dict))

## class 'dict'

print(this_dict['name'])

## 'Masum Rana'

print(this_dict['nickname'])

## 'masum'

print(this_dict['age'])

## '24'
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

# {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

del this_dict['age']

print(this_dict)

# {'name': 'Masum Rana', 'nickname': 'masum'}
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

this_dict.clear()

print(this_dict)

## {}
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

del this_dict print(this_dict)

## Traceback (most recent call last):

## File “”, line 1, in 

## NameError: name 'this_dict' is not define
 

person1 = {'name': 'masum','age': 24}

person2 = {'name': 'mim','age': 25}

person3 = {'name': 'nahid','age': 24}

person_dict = {'person1': person1, 'person2': person2, 'person3': person3 }

print(person_dict)

## 'person1': { 'name': 'masum', 'age': 24},

## 'person2': { 'name': 'mim', 'age': 25 },

## 'person3': { 'name': 'nahid', 'age': 24 } }
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(len(this_dict))

# 3
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(this_dict.copy())

## 'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(dict(this_dict))

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(this_dict.get('name'))

## 'Masum Rana'

this_dict.get('home')

print(this_dict.get('home',' kicu nei'))

## kichhu nei
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

'home'in this_dict

## False

'name'in this_dict

## True
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(this_dict.items())

## dict_items([('name', 'Masum Rana'), ('nickname', 'masum'), ('age', '24')])
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(this_dict.keys())

## dict_keys(['name', 'nickname', 'age'])
 

this_dict ={'name': 'Masum Rana', 'nickname': 'masum', 'age':'24'}

print(this_dict)

## {'name': 'Masum Rana', 'nickname': 'masum', 'age': '24'}

print(this_dict.values())

## dict_values(['Masum Rana', 'masum', '24'])
 

python3 my_dict ={'one' : 25, 'three':50}

my_dict.setdefault('two',22)

my_dict.setdefault('one',2)

print(my_dict)

## Output:

## {'one': 25, 'three': 50, 'two': 22}
 

dict_1 = {

'monday':'8h',

'tuesday':'10h',

'wednesday':'15h'

}

dict_2 ={

'thurseday':'1h',

'friday':'5h'

}

dict_1.update(dict_2)

print(dict_1)

print(dict_2)

## Output:

## {'monday': '8h', 'tuesday': '10h', 'wednesday': '15h', 'thurseday': '1h', 'friday': '5h'}

## {'thurseday': '1h', 'friday': '5h'}
 

**Creating an empty dictionary**

my_dict = {}

a = 10

b = 20

c = 30

# make a dictionary with above (a,b,c) variable and it's value

my_dict = dict(a=10 ,b=20, c=30)

print(my_dict)

# access 'a' from the dictionary

print(my_dict['a'])

# update the value of key 'b' with None

my_dict['b'] = None

print(my_dict)
 

# remove 'c' key from the dictionary

del my_dict['c']

print(my_dict)

# add an key named 'new' in the dictionary

my_dict['new'] = 150

print(my_dict)

# conquer anothe dictionary to this dictionary

another = {'hi': 'world', 'hello': 'world'}

my_dict.update(another)

print(my_dict)

# get only values and show it

values = list(my_dict.keys())

print(values)
 

# get vs [] for retrieving elements

my_dict = {'name': 'Akash', 'age': 26}

# Output: Jack

print(my_dict['name'])

# Output: 26

print(my_dict.get('age'))

# Trying to access keys which doesn't exist throws error

# Output None

print(my_dict.get('address'))

# KeyError

print(my_dict['address'])
 

import operator

d = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}

print('Original dictionary : ',d)

sorted_d = sorted(d.items(), key=operator.itemgetter(1))

print('Dictionary in ascending order by value : ',sorted_d)

sorted_d = dict(sorted(d.items(), key=operator.itemgetter(1),reverse=True))

print('Dictionary in descending order by value : ',sorted_d)
 

from heapq import nlargest

my_dict = {'a':500, 'b':5874, 'c': 560,'d':400, 'e':5874, 'f': 20}

three_largest = nlargest(3, my_dict, key=my_dict.get)

print(three_largest)
 

some = {

'asif': {

'roll' : 10,

'subject' : ['bangla', 'english'],

'phone' : “054545454”

},

'rayhan': {

'roll' : 20,

'subject' : ['history', 'geology'],

'phone' : “054545454”,

'child':{

'rony' : [500,1000,1500,True]

}

},

}