# Even Odd in Python

Published on 16 October 2019 (Updated: 16 October 2019)

In this article, we will write a program to determine if an integer is even or odd in Python.

## How to Implement the Solution

Let’s look at the code in detail:

code for even-odd.py:-

```
import sys
def even_odd(x):
return "Even" if x % 2 == 0 else "Odd"
def exit_with_error():
print('Usage: please input a number')
sys.exit(1)
def main(args):
try:
num = int(args[0])
print(even_odd(num))
except (IndexError,ValueError):
exit_with_error()
if __name__ == "__main__":
main(sys.argv[1:])
```

Here we have a function called even_odd that returns “Even” if a number is even and “Odd” if it is odd. We are checking this using the modulus operator (%) which returns the remainder after division. The result after a modulo operation of an even integer will always be 0 while the result after a modulo operation of an odd integer will always be 1.

Ex. 14 % 2 => 0 (14 / 2 is 7 with no remainder) 15 % 2 => 1 (15 / 2 is 7 with a remainder of 1)

## How to Run Solution

If we want to run this program, we should probably download a copy of Hello World in Python. After that, we should make sure we have the latest Python interpreter. From there, we can simply run the following command in the terminal:

```
python even-odd.py <input>
```

With being any integer. For example

```
python even-odd.py 12
```

Alternatively, we can copy the solution into an online Python interpreter and hit run.