Odd or Even with Modulo

[jakey]

I am a Python3 beginner and have been trying to get the following code to tell me if a number is odd or even without any luck.

def is_even(num):
    return num % 2 == 0

Could someone please help an old noob and show him how to get some output from the above code.

Many thanks for any help or advice.

 

[menator01]

Maybe this will help

def func(num):
    return 'even' if num % 2 == 0 else 'odd'

for i in range(5):
    print(f'{i} is {func(i)}')

Output

0 is even
1 is odd
2 is even
3 is odd
4 is even

 

[VBService]

For the record, you named the function "is_even", so you should expect only information whether "is_even" is even and returns true, or "is_even" is not even and returns false.

trying to get the following code to tell me if a number is odd or even

To make the code more unambiguously readable IMO it should be looks like e.g.:

def is_even(num):
    return num % 2 == 0
  
def is_odd(num):
    return not num % 2 == 0 

for i in range(6):
    if is_even(i):
        print(f'{i} is even')
      
for i in range(6):     
    if is_odd(i):
        print(f'{i} is odd')

why? ...
Function naming conventions

Using proper names for functions in programming is important because:

1. Readability: Clear names make code easier to understand.
2. Maintenance: Easier to update and debug.
3. Collaboration: Helps team members understand and work with the code.
4. Reusability: Good names make libraries and APIs more intuitive to use.
5. Documentation: Improves both automated and manual documentation.
6. Avoiding Confusion: Reduces ambiguity and errors.

Example:

• def calc(a, b): vs. def calculate_sum(a, b):

The second name is clearer about the function's purpose.

different scenario

def is_even_odd(num):
    return num % 2 == 0

for i in range(6):
    print('is', i, 'even', str(is_even_odd(i)))

or some very similar what @menator01 written

def is_even_odd(num):
    return 'even' if num % 2 == 0 else 'odd'

for i in range(6):
    print(i, 'is', is_even_odd(i))

 

[WhiteCube]

"parity_name" is more readable than "is_even_odd"

 

[WhiteCube]

Naming things is the bane of my existence.

Programming books suggest that the best identifier is short and meaningful.

If anyone has a system that makes short AND meaningful identifiers, I'd be very interested in reading it.

 

[VBService]

Naming things is the bane of my existence.

But anyway, you did great work.

is_even_odd => parity_name

Have you read this?
API Design Guidelines

IMHO, the advice given in this article (in the link provided above) can also be applied to function naming in any programming language.

 

[WhiteCube]

Thanks for the link, I'll read it.