How to add on python [closed]

Answer 1

age = input('How old are you?')
print('On your next birthday you will be' + str(int(age)+1) + 'years old.')

Answer 2

How about this?

age += 1

or

age = age + 1

Make sure you are casting the user's input from a string to an integer.

Answer 3

In order to increase age by one, you need it to be an integer. Try:

age = int(input("How old are you? ")
age += 1
print("On your next birthday you will be" + str(age) + "years old")