DICTIONARY DATA OPERATIONS
==========================
LIST, TUPLE, SET ==> COLLECTION WITH VALUES
[1,2,3,4] ==> LIST
(1,3,5,7,9) ==> TUPLE
{1,2,3,4,5} ==> SET

APPLICATION FORM:
=================
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COMPUTER ===> SERVER
	KEY AND VALUE PAIR FORMAT

WHAT IS DICTIONARY?
==================
1) COLLECTION DATATYPE
	COLLECTION OF ITEMS
HERE: ITEM ==> KEY AND VALUE PAIR
Syntax:
	key : value
Syntax:
	dictionary-name = {key1:value1,key2:value2,key3:value3}

Ex: record = {'name' :'ravi','gender' : 'male','phone' : 8977029779,'mail' : 'abc@gmail.com'}

Properties of Dictionary Data:
==============================
1) {}
2) Inbuilt Datatype
	an inbuilt class
		dict
	type()
3) Dictionary is a collection of key and value pairs
4) Keys in Dictionary ==> with any datatype
5) Values in dictionary ==> with any datatype

Note:
====
Keys always considered to define with primitive datatypes only
values can possible to define with primitive datatypes and collections also.
6) Homogeneous elements
7) Heterogeneous elements

keys ==> same datatype and values ==> same datatype ==> Homogeneous
ex: 'str1' : 10, 'str2' : 20

keys ==> different datatype and values ==> different datatype ==> Heterogeneous
ex: 12 : 'str1', 'str2: 12.23 
8) Ordered datatype
9) Keys ==> Unique/not duplicated
10) Values ==> Duplicated
11) Mutable datatype
12) Not Index Supported
to access the individual values from the dictionary, we can use "keys"
Syntax:
	dict-name[key]

Note:
====
if index value is as a key in a dictionary, the value of dictionary can be accessed
if index value is as not a key ==> Key Error.

# Properties of Dictionary

d1 = {}     # empty dictionary
d2 = set()  # empty set
d3 = {11 : 'a','b' : 21, 1-2j : True}       # Heterogeneous
# d4 = {[1,2,3] : (1,2,3)}
d4 = {'list' : [1,2,3,4],'tuple' : (1,3,5,7,9),'set' :{11,13,15,17,19}}
d5 = {'a' : 11,'b' : 22, 'c':33}    # Homogeneous
d6 = {'abc' : 111,'def' : 222, 'ghi' : 333, 'abc' : 555}
d7 = {'a' : 10,'b' : 20,'c' : 30,'d':30,'e':20,0:245}

print(type(d1));print(type(d2));print(type(d3));print(type(d4));print(type(d5))
print(d1);print(d2);print(d3);print(d4);print(d5);print(d6);print(d7)

print(d3['b']);print(d4['set']);print(d5['a']);print(d6['abc'])
print(d7[0])
# print(d7[1])

print(id(d7))
print(d7)

# adding of element into dictionary, we can use key and value
d7['pqr'] = {1,3,5,7,9}
d7['a'] = 100
print(id(d7))
print(d7)

==============================================================

Traversing On Dictionary Data:
==============================

# WAP TO ENTER NAME AND PERCENTAGE OF MARKS IN A DICTIONARY AND DISPLAY THAT INFORMATION.

stu_record = dict()     # empty dictionary

size = int(input("Enter the size of the record:"))

print("Enter The student data:")

i = 1

while i <= size:
    name = input("Enter the name of the student:")
    percentage = input("Enter the percentage of the student:")
    stu_record[name] = percentage
    i = i + 1

print("Student's Name","\t","Student's Percentage")
for stu in stu_record:
    print('\t',stu,'\t\t\t',stu_record[stu])

==============================================

Delete the data from Dictionary:
===============================
1) del property
===============
==> using 'key', we can delete any data from the dictionary
Syntax:
	del dict-name[key]
==> we can delete whole dictionary data permanently.
Syntax:
	del dict-name

Note: if the specified key is not in the dictionary ==> Key error.

d1 = eval(input("Enter a dictionary:"))

print("The Dictionary is = ",d1)

del d1[33]

print("The Dictionary is = ",d1)

del d1

print(d1)

===========================================================
2) clear()
==========
==> to clear the whole dictionary, we can use clear()

Syntax:
	dict-name.clear()

d1 = eval(input("Enter a dictionary:"))

print("The Dictionary is = ",d1)

d1.clear()

print("The Dictionary is = ",d1)

=========================================================
3) pop()
=========
we can use to delete the data based on the key.
Syntax:
	dict-name.pop(key)

d1 = eval(input("Enter a dictionary:"))

print("The Dictionary is = ",d1)

d1.pop('d')

print("The Dictionary is = ",d1)

========================================================
4) popitem()
===========
==> we can use to delete the data in arbitrary format (key and value) from the end of the dictionary.
Syntax:
	dict-name.popitem()

d1 = eval(input("Enter a dictionary:"))

print("The Dictionary is = ",d1)

d1.popitem()

print("The Dictionary is = ",d1)