??-{}:

--> ?:? ??? ??? ? ??
--> ??, ?? ???? ??? ???? ????.

??:
1.

menu = {'idli':10, 'dosai':20, 'poori':30}
print(menu)

menu['pongal'] = 40 

del menu['idli']
print(menu)

print(menu['dosai'])

??:

{'idli': 10, 'dosai': 20, 'poori': 30}
{'dosai': 20, 'poori': 30, 'pongal': 40}
20

2. ? ??? ?:? ?? ????? get() ?? ??

time_table = {}

time_table['tamil'] = 10
time_table['english']= 10

print(time_table)

print(time_table['tamil'])
print(time_table.get('tamil'))
print(time_table.get('maths'))
print(time_table['maths'])

??:

{'tamil': 10, 'english': 10}
10
10
None
KeyError: 'maths'

--> ????? ??? ?? ?? ???? KeyError? ?????.
--> ?? get() ??? ???? ???? ???? ????.

3.?, ? ? ? ? ????

menu = {'idli':10, 'dosai':20, 'poori':30}
print(menu)
print(menu.keys())
print(menu.values())
print(menu.items())

??:

{'idli': 10, 'dosai': 20, 'poori': 30}
dict_keys(['idli', 'dosai', 'poori'])
dict_values([10, 20, 30])
dict_items([('idli', 10), ('dosai', 20), ('poori', 30)])

?-->??(dict_name.keys())?? ?? ?????.
?-->??(dict_name.values())?? ?? ?????.
??-->?? ?? ??(dict_name.items())? ??? ?????.

4. ???? ??? ?, ? ?? ??? ?????.

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}

for fruit in fruits_menu.keys():
    print(fruit)

for price in fruits_menu.values():
    print(price)

for fruit, price in fruits_menu.items():
    print(fruit, price)

??:

apple
banana
grapes
100
80
120
apple 100
banana 80
grapes 120

5. ?? ?? 'e'? ???? ??? ?? ?????.

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}

for fruit in fruits_menu.keys():
    if 'e' in fruit:
        print(fruits_menu[fruit])

??:

100
120

6. ??? ???? ???? ?????.

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}

print(list(fruits_menu))
print(tuple(fruits_menu))

??:

['apple', 'banana', 'grapes']
('apple', 'banana', 'grapes')

7. ??? ??.

emp1 = {'name':'guru prasanna', 'qual':'B.Com'}
emp2 = {'name':'lakshmi pritha', 'qual': 'M.E'}

print(emp1)
print(emp2)

employees = {101:emp1, 102:emp2}
print(employees)

??:

{'name': 'guru prasanna', 'qual': 'B.Com'}
{'name': 'lakshmi pritha', 'qual': 'M.E'}
{101: {'name': 'guru prasanna', 'qual': 'B.Com'}, 102: {'name': 'lakshmi pritha', 'qual': 'M.E'}}

8. ?? ??? ???? ????.

emp1 = {'name':'guru prasanna', 'qual':'B.Com'}
emp2 = {'name':'lakshmi pritha', 'qual': 'M.E'}


employees = {101:emp1, 102:emp2}
print(employees)

for roll_no, employee in employees.items():
    for key, value in employee.items():
        if key == 'name':
            print(employee[key])

??:

{101: {'name': 'guru prasanna', 'qual': 'B.Com'}, 102: {'name': 'lakshmi pritha', 'qual': 'M.E'}}
guru prasanna
lakshmi pritha

9. ??? ?? ?? ????.

emp1 = {'name':'guru prasanna', 'qual':'B.Com'}
emp2 = {'name':'lakshmi pritha', 'qual': 'M.E'}

employees = {101:emp1, 102:emp2}

for roll_no, employee in employees.items():
    for key, value in employee.items():
        if value == 'B.Com':
            print(employee['name'])

??:

guru prasanna

10. ? ?? 10%? ????

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}
for fruit in fruits_menu.values():
    fruit=fruit+(fruit/10)
    print(fruit)

??:

110.0
88.0
132.0

11. ?? ?????--> ??? ??--> ??.

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}
new_menu = {}

for fruit,price in fruits_menu.items():
    new_menu[price] = fruit

print(new_menu)

??:

{100: 'apple', 80: 'banana', 120: 'grapes'}

?? ??

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}

menu_dict = {(fruit,price) for fruit,price in fruits_menu.items()}
print(menu_dict)

menu_dict = {fruit: price for fruit,price in fruits_menu.items()}
print(menu_dict)

#To reverse key-->value and value-->key

menu_dict = {price : fruit for fruit,price in fruits_menu.items()}
print(menu_dict)

??:

{('grapes', 120), ('apple', 100), ('banana', 80)}
{'apple': 100, 'banana': 80, 'grapes': 120}
{100: 'apple', 80: 'banana', 120: 'grapes'}

get()
get() ???? ??? ?? ?? ??? ?? ?????.
-->?? ??? ???? ??? ?? ?? ???? ????.

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}

print(fruits_menu.get('apple',"not available"))
print(fruits_menu.get('kiwi',"not available"))

??:

100
not available

??? ????? ??? ?? ??

#frequency of each letter in a given string
freq = {}
name = 'guruprasanna'
for letter in name: 
    freq[letter] = freq.get(letter,0)+1

print(freq)

??:

{'g': 1, 'u': 2, 'r': 2, 'p': 1, 'a': 3, 's': 1, 'n': 2}

??? ???? ?????

csk = {'dhoni':101, 'jadeja':102}
india = {'virat':103, 'jadeja':102}

print(set(csk))
print(set(india))

print(set(csk.keys()))
print(set(india.keys()))

??:

{'dhoni', 'jadeja'}
{'virat', 'jadeja'}
{'dhoni', 'jadeja'}
{'virat', 'jadeja'}

??? ??()

--> setdefault() ???? ??? ?? ?? ??? ?? ?????.
--> ?? ???? ??? ??? ??? ?? ?????.

csk = {'dhoni':101, 'jadeja':102}
india = {'virat':103, 'jadeja':102}

csk.setdefault('rohit',100)
print(csk)
csk.setdefault('dhoni',100)
print(csk)

??:

menu = {'idli':10, 'dosai':20, 'poori':30}
print(menu)

menu['pongal'] = 40 

del menu['idli']
print(menu)

print(menu['dosai'])

??:

1. ??:
a) ?? ??
b) ? ? ??? ??
c) ? ???? ??

{'idli': 10, 'dosai': 20, 'poori': 30}
{'dosai': 20, 'poori': 30, 'pongal': 40}
20

??:

time_table = {}

time_table['tamil'] = 10
time_table['english']= 10

print(time_table)

print(time_table['tamil'])
print(time_table.get('tamil'))
print(time_table.get('maths'))
print(time_table['maths'])

2. ????? 'a rose is a rose is a rose' ??? ??? ????.

{'tamil': 10, 'english': 10}
10
10
None
KeyError: 'maths'

??:

menu = {'idli':10, 'dosai':20, 'poori':30}
print(menu)
print(menu.keys())
print(menu.values())
print(menu.items())

3. ??, ???, ????? ???? ?????.
???? = {'jaiswal':75, 'rohit':55, 'virat':95}

{'idli': 10, 'dosai': 20, 'poori': 30}
dict_keys(['idli', 'dosai', 'poori'])
dict_values([10, 20, 30])
dict_items([('idli', 10), ('dosai', 20), ('poori', 30)])

??:

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}

for fruit in fruits_menu.keys():
    print(fruit)

for price in fruits_menu.values():
    print(price)

for fruit, price in fruits_menu.items():
    print(fruit, price)

apple
banana
grapes
100
80
120
apple 100
banana 80
grapes 120

??:

fruits_menu = {'apple':100, 'banana':80, 'grapes':120}

for fruit in fruits_menu.keys():
    if 'e' in fruit:
        print(fruits_menu[fruit])

? ??? Python Day-Dictionary- ??, ??? ?? ?????. ??? ??? PHP ??? ????? ?? ?? ??? ?????!