GRADE XI - PYTHON DICTIONARY - 06-11-2024

 GRADE XI 

PYTHON DICTIONARY

Python Dictionary is collection of elements where each element is a key-value pair.

#CREATE DICTIONARY

d={}    #EMPTY DICTIONARY

print(d)

#print(type(d))     #type of data

#METHOD TO CREATE DICTIONARY

dict= {} or d1 = dict()

dict1={'mihir':'gurgaon','Agastya':'delhi','Palak':'GGN'}

print(dict1)

#insert data in Empty Dictionary

D1={}

D1[1]="ONE"

D1[2]="TWO"

D1[3]="THREE"

D1[4]="FOUR"

print(D1)

#APENDING VALUES IN DICT

dict1={'R':'Rain','B':'Ball','C':'Cat','T':'Tree','Age':15}

dict1['Name']='Preeti'

print(dict1)

#UPDATING ELEMENTS IN A DICTIONARY

dict1={'R':'Rain','B':'Ball','C':'Cat','T':'Tree','Age':15}

dict1['Name']="RIYA"

print(dict1)

#TRAVERSING A DICTIONARY

dict1={'R':'Rain','B':'Ball','C':'Cat','T':'Tree','Age':15}

for i in dict1:

    print(i,':',dict1[i])

# COMMON DICTIONARY FUNCTIONS AND METHODS

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

res=len(A)

print(res)

#clear function - it removes all the items from the dictionary

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

A.clear()

print(A)

#get() - Returns the value for given key

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

res=A.get('Wed')

print(res)

#items() - returns the content of dictionary

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

res=A.items()

print(res)

#key()- It return list of key values in a dictionary

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

res=A.keys()

print(res)

#Values() - returns a list of values from key-value pairs in a dictionary

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

res=A.values()

print(res)

#REMOVING AN ITEM FROM DICTIOARY

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

del A['Wed']

print(A)

#If Particular Key is not there , it will result in error

#A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

#del A['Fri']

#print(A)

#Remove Item using pop(key)

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

A.pop('Wed')

print(A)

#IN AND NOT IN MEMBERSHIP OPERATOR

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

res='Thu' in A

print(res)

A={"Mon":"Monday","Tue":"Tuesday","Wed":"Wednesday","Thu":"Thursday"}

res='Mon' not in A

print(res)

print("😎\n" *5)

#Try to copy any emoji you wish

#(https://tools.picsart.com/text/emojis/) and build your own pattern

print(''.join("😉" *5))

print('\n'.join("😉" *5))

n = 5

print('\n'.join("😉" * i for i in range(1, n + 1)))

print("😉\n" +"💢" )

PRACTICE QUESTIONS

1. #CREATE A DICT WHICH STORES NAME AND PH NO OF YOUR FRIENDS(ANY 5)

#AND DISPLAY THE NAMES AND PH_NO IN THE DICTIONARY.

Sol:

phdict={"Kavya":2345,"Agastya":5667,"Mihir":7890,"Palak":6544,"Sanya":555}

for name in phdict:

    print(name,":",phdict[name])

2.#WAP to create a dictionary of two workers and their names as keys and other details in the form 

of values

Sol:

employee={'Riya':{'age':25,'Salary':20000},'Divya':{'age':35,'Salary':50000}} 

for key in employee:

    print("Employee",key,":")

    print("Age:",employee[key]['age'])

    print("Salary:",employee[key]['Salary'])

3.WAP to create a dictionary containing names of competition winner students as KEY and number of their wins as values

Sol:

n=int(input("How Many Students ?")) 

compwinner={ }

for i in range(n):

    key=input("Enter Name of the Student:")

    value=int(input("Enter No of Wins:"))

    compwinner[key]=value

print("The Dictionary is:", compwinner)

4.#WAP TO INPUT TOTAL NO OF SECTIONS AND STREAM IN 11TH CLASS AND DISPLAY ALL

Sol:

5.WAP to create a dictionary containing roll number of students and percentage as values for n number of students display the total number of students scoring more than 80

Sol:

stud={ }# Empty dictionary created

n=int(input("enter number of students - "))

for i in range(n):

       rno = input("enter Roll No - ")

      stud[rno] = float(input("Enter percentage –"))

ctr=0

for rno in stud:

    if stud[rno]>80:

        ctr+=1

print("No. of students scoring percentage above 80 –" ,ctr)

6.#Program to create a dictionary which stores names(key) of employees and their salary(value)

7.Write a program to create a dictionary a key:valuepair for “n” number of elements . Check and display whether the dictionary with different keys have same values or not. Display appropriate message.

Sol:

d1 = {}

n = int(input("Enter number of elements: "))

# Input keys and values

for i in range(n):

    key = int(input("Enter key: "))

    d1[key] = eval(input("Enter value: "))

# Check for duplicate values

found_duplicate = False

for k in d1: #iterates over each key in the dictionary

    cnt = 0

    for k1 in d1:            # iterates over all the keys in the dictionary again, checking if the value     

                                       associated with key k  

        if d1[k] == d1[k1]:

            cnt += 1

        if cnt > 1:

            break

    if cnt > 1:

        found_duplicate = True

        print("Keys have the same value")

        break

if not found_duplicate:

    print("No keys have the same value")

8.WAP TO INPUT NAMES(KEY) OF 'N' COUNTRIES AND THEIR CAPITAL AND CURRENCY(VALUES) STORE IT IN A DICTIONARY. ALSO SEARCH AND DISPLAY A PARTICULAR COUNTRY

dict={}    

n=int(int(input("Enter Number of countries")))

for i in range(n):

    cname=input("Enter country name")

    cap=input("Enter Capital name")

    curr=input("Enter Currency")

    dict[cname]=[cap,curr]   #Value as list assigned

sname=input("Enter country name to search")

for cn in dict:

    if cn==sname:

        print("Name found in dictionary")

        print("details of",cn,"-",dict[cn])

        break

    else:

        print("Country name not found")