Page 525 - ComputerScience_Class_11

Program 5: Write a program to count the frequency of each character in a string using a dictionary and a function.
Program 5.py

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def count_character_frequency(input_string):
frequency = {}
# Loop through each character in the string
for char in input_string:
if char in frequency:
frequency[char] += 1 # Increase count if character already exists
else:
frequency[char] = 1 # Add character with count 1 if it is not present
return frequency
text = "hello world"
# Call the function
char_frequency = count_character_frequency(text)
# Print the result
print("Character frequencies:", char_frequency)

Output

Character frequencies: {'h': 1, 'e': 1, 'l': 3, 'o': 2, ' ': 1, 'w': 1, 'r': 1, 'd': 1}

Program 6: Write a program to verify login details using a dictionary.
Program 6.py

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def verify_login(login_details, username, password):
if username in login_details:
if login_details[username] == password:
return "Login successful"
else:
return "Incorrect password"
else:
return "Username not found"
login_details = { 'yogesh101': 'password123', 'nitin2': 'securepass',
'ritik123': 'mysecret', 'arjun': 'password321' }
username_input = input("Enter your username: ").lower()
password_input = input("Enter your password: ")
login_result = verify_login(login_details, username_input, password_input)
print(login_result)

Output

Enter your username: ritik123
Enter your password: mysecret
Login successful

For Advance Learners: Functions in Python 523