How do you calculate input in python without using two inputs in Python 3?

Question

How do I calculate 1+2+3+4+5 on Python 3?

n = int(input())
print(n)

The above code works in Python 2 however it doesn't work in Python 3.

Input

1+2+3+4+5

Output

15

Thank you.

Answer 1

Try ast.literal_eval like this in Python 3:

from ast import literal_eval
n = input()
print(literal_eval(n))

Example:

1+2+3+4+5
15

The reason it works in Python 2 is because in Python input was the same as eval in Python 3, to have a regular input in Python 2 you have to use raw_input.

Answer 2

Python's eval() allows you to evaluate arbitrary Python expressions from a string-based or compiled-code-based input. This function can be handy when you're trying to dynamically evaluate Python expressions from any input that comes as a string or a compiled code object.

a = eval(input())
print(a)