Код:

students = {

"Petrov": 16,

"Sidorov": 17,

"Ivanov": 18,

"Melnikov": 19,

"Vasiliev": 20,

"Kuznetsov": 16,

"Popov": 17,

"Golovin": 18,

"Zubkov": 19,

"Bogdanov": 20

}

# Increases the age of all students by 1

for key in students:

students[key] += 1

# If the age is more than 17, reduce it by 2

for key in students:

if students[key] > 17:

students[key] -= 2

# Delete an element from the dictionary if the student is 18 years old

for key in list(students.keys()):

if students[key] == 18:

del students[key]

# Display the dictionary

print(students)

# Display the values of dictionary elements for which the age value is 16

result = {key: value for key, value in students.items() if value == 16}

print(result)

Вывод:

{'Petrov': 16, 'Sidorov': 16, 'Melnikov': 17, 'Vasiliev': 18, 'Kuznetsov': 16, 'Popov': 16, 'Zubkov': 17, 'Bogdanov': 18}

{'Petrov': 16, 'Kuznetsov': 16, 'Popov': 16}