DICTIONARY PRACTICE QUESTIONS
1. Create a dictionary with the Rollno, Name and marks
of students and display the name of students, who have scored
marks above 75.
Sol:
# Input the number of students
no_of_std = int(input("Enter number of students: "))
result = {}
# Loop to enter details of each student
for i in range(no_of_std):
print("Enter Details of student No.", i + 1)
roll_no = int(input("Roll No: ")) # Input Roll Number
std_name = input("Student Name: ") # Input Student Name
marks = int(input("Marks: ")) # Input Marks
result[roll_no] = [std_name, marks] # Store details in dictionary
# Print the dictionary with all students' details
print(result)
# Display names of students who have got marks more than 75
print("Students who scored more than 75 marks are:")
for student in result:
if result[student][1] > 75: # Check if marks > 75
print(result[student][0]) # Print the student's name
2. Python program to convert a number entered by the user
into its corresponding number in words Eg: 123
- one two three [NCERT]
SOL:
num = input("Enter any number: ")
numberNames = {0:'Zero',1:'One',2:'Two',3:'Three',4:'Four',\
5:'Five',6:'Six',7:'Seven',8:'Eight',9:'Nine'}
result = ''
for ch in num:
key = int(ch) #converts character to integer
value = numberNames[key]
result = result + ' ' + value
print("The number is:",num)
print("The numberName is:",result)
3. Write a menu-driven program to create a dictionary
containing roll numbers as keys. The value part is a list with marks of 5
subjects, total marks, percentage, and grade. The grade is assigned based on
the given criteria:
Grade Criteria:
- >
90 → Grade A
- >=
75 and < 90 → Grade B
- <
75 → Grade C
SOL:# -*- coding: utf-8 -*-
"""
Created on Tue Nov 12 09:47:02 2024
@author: Kirti Hora
"""
stud = {} # Dictionary to store student details
n = int(input("Enter no. of students: "))
# Loop to enter student details
for i in range(n):
dets = [] # List to store details of each student
# Input student roll number
rno = int(input("Enter roll no: "))
# Input student name
name = input("Enter name: ")
dets.append(name)
# Input 5 marks
for m in range(1,6):
marks = float(input("Enter marks for subject:"))
dets.append(marks)
# Calculating total and percentage
tot = sum(dets[1:6]) # Sum of marks (index 1 to 5)
percentage = (tot / 500) * 100
# Adding total and percentage to the details list
dets.append(tot)
dets.append(percentage)
if percentage >= 90:
grade = "A"
elif percentage >= 75:
grade = "B"
else:
grade = "C"
# Adding grade to the details list
dets.append(grade)
# Storing the student details in the dictionary with roll number as the key
stud[rno] = dets
# Output the final student dictionary
print("\nStudent Details:")
for roll_no, details in stud.items():
print("Roll No:",roll_no , "Details",details)
Q4.Write a program to input your friends’ names and their Phone
Numbers and store them in the dictionary as the key-value pair. Perform the
following operations on the dictionary:
a) Display the name and phone number of all your friends
b) Add a new key-value pair in this dictionary and display the modified
dictionary
c) Delete a particular friend from the dictionary
d) Modify the phone number of an existing friend
e) Check if a friend is present in the dictionary or not
f) Display the dictionary in sorted order of names
Sol:
# -*- coding: utf-8 -*-
"""
Created on Wed Nov 13 08:16:26 2024
@author: Kirti Hora
"""
dic = {}
while True:
print("1. Add New Contact")
print("2. Modify Phone Number of Contact")
print("3. Delete a Friend's contact")
print("4. Display all entries")
print("5. Check if a friend is present or not")
print("6. Display in sorted order of names")
print("7. Exit")
inp = int(input("Enter your choice (1-7): "))
# Adding a contact
if inp == 1:
name = input("Enter your friend's name: ")
phonenumber = input("Enter your friend's contact number: ")
dic[name] = phonenumber
print("Contact Added\n")
# Modifying a contact if the entered name is present in the dictionary
elif inp == 2:
name = input("Enter the name of the friend whose number is to be modified: ")
if name in dic:
phonenumber = input("Enter the new contact number: ")
dic[name] = phonenumber
print("Contact Modified\n")
else:
print("This friend's name is not present in the contact list\n")
# Deleting a contact if the entered name is present in the dictionary
elif inp == 3:
name = input("Enter the name of the friend whose contact is to be deleted: ")
if name in dic:
del dic[name]
print("Contact Deleted\n")
else:
print("This friend's name is not present in the contact list\n")
# Displaying all entries in the dictionary
elif inp == 4:
print("All entries in the contact list:")
if dic:
for name in dic:
print(name, "\t\t", dic[name])
else:
print("No contacts available.")
print("\n")
# Searching a friend's name in the dictionary
elif inp == 5:
name = input("Enter the name of the friend to search: ")
if name in dic:
print("The friend", name, "is present in the list with contact number:", dic[name], "\n")
else:
print("The friend", name, "is not present in the list\n")
# Displaying the dictionary in sorted order of the names
elif inp == 6:
print("Name\t\t\tContact Number")
for name in sorted(dic.keys()):
print(name, "\t\t\t", dic[name])
print("\n")
# Exit the while loop if user enters 7
elif inp == 7:
print("Exiting the program. Goodbye!")
break
# Displaying the invalid choice when any other values are entered
else:
print("Invalid Choice. Please try again\n")
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