DICTIONARY OPERATIONS:
======================
TRAVERSING ON DICTIONARY DATA:
==============================
WHILE
FOR 

# WAP TO ENTER NAME AND PERCENTAGE OF MARKS IN A DICTIONARY AND DISPLAY THE INFORMATION ON THE SCREEN

"""
record = {"stu1":77%,"stu2":78%,"stu3":79%}

1) create the empty dictionary.
2) add items into the dictionary.
    item ==> pair of name and percentage marks
3) display the dictionary information
"""

# record = {}
record = dict()

n = int(input("Enter the count for the record:"))

i = 1

while i <= n:
    name = input("Enter the name of the student:")
    percentage = input("Enter percentage marks of the student:")

    record[name] = percentage

    i += 1

print("The Student Data in the given record is:")

for item in record:
    print("\t",item,"\t\t\t",record[item])

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

How to modify the dictionary data?
==================================

"""
for the modification:
1) create the dictionary
2) type of definition
3) add the item into the dictionary
    dict-name['new-key'] = value
4) modification on the dictionary
    dict-name['mod_key'] = new-value
"""
fruits = eval(input("Enter the record of Fruits:"))

print(type(fruits))
print(id(fruits))

# adding items into dictionary

fruits['Kiwi'] = 250
fruits['JackFruit'] = 125

# modification of items in dictionary

fruits['Banana'] = 500
fruits['Cherry'] = 1000

# printing of dictionary

print(fruits)
print(id(fruits))

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

Delete Operations on Dictionary:
================================
1) del property:
================
==> using del property, we can delete the specific item from the dictionary
Syntax:
	del dict-name[key]

==> we can delete the whole dictionary
Syntax:
	del dict-name

# delete operations

record = dict({'Amisha':'77%','Hyma':'78%','Gazala':'79%','abc':'90%'})
rec = dict({('Amisha','87%'),('Gazala','88%'),('Hyma','89%')})

print(type(rec))
print(type(record))

print(record)
print(rec)

# deletion of specific item from dictionary

del record['abc']

print(record)

# deletion of whole record

del rec

# print(rec)

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

2) clear():
==========
==> can use to clear the whole data from the dictionary.
==> return an empty dictionary.

Syntax:
	dict-name.clear()

record = dict({'Amisha':'77%','Hyma':'78%','Gazala':'79%','abc':'90%'})
rec = dict({('Amisha','87%'),('Gazala','88%'),('Hyma','89%')})

print(record)
print(rec)

record.clear()
rec.clear()

print(record)
print(rec)

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

3) pop():
========
==> which can use to delete the value of the dictionary which is corresponding to the specified key
Syntax:
	dict-name.pop(key)
==> returns: value, which is deleting
==> if the specified item is not in the given dictionary:
	"key Error"
==> if the pop() can define without specifying the key.
	"type Error".

record = dict({'Amisha':'77%','Hyma':'78%','Gazala':'79%','abc':'90%'})

print(record)

ret = record.pop('abc')

print(ret)
print(record)

# record.pop('abc')
# record.pop()

=================================
4) popitem()
============
==> delete the arbitrary items (pair of key and value) of the dictionary from the last by default.
==> return: that pair which is deleting.

Syntax:
	dict-name.popitem()

record = dict({'Amisha':'77%','Hyma':'78%','Gazala':'79%','abc':'90%'})

print(record)

data = record.popitem()

print(data)
print(record)

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

Finding length of the dictionary:
=================================
len()
=====
can use to find the length of any collection.
Syntax:
	len(dictionary-name)

# finding length

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

length = len(dictionary)

print("Length of the dictionary is = ",length)
==============================

Assignment:
==========
WAP IN PYTHON TO FIND THE LENGTH OF ANY COLLECTION (Dictionary) WITHOUT USING ANY PRE-DEFINED METHOD.