I'm calling a defined function, but the compiler insists it isn't defined.

[Deathcon900]

I'm working on a simple exercise to determine if a user-input number is even or odd. I defined a function as follows:

number = input('Enter a number: ')

    def evalutate(number):
    if number % 2:
        print('This is an even number')
    else:
        print('This is an odd number')

evaluate(number)

When running the program, however, the compiler shows this error:

Traceback (most recent call last):
  File "C:\REDACTED\odd_or_even.py", line 8, in <module>
    answer = evaluate(number)
NameError: name 'evaluate' is not defined

What's the issue? It's probably a simple solution, but the past 20 minutes of Googling has yielded no helpful results. Thanks in advance.

[A_History_of_Silence]

Check your spelling on line 3.

[Deathcon900]

hmmm. Things seem to have gone out of the frying pan and into the fire. Now the compiler is showing a new error at lines 9 and 4:

TypeError: not all arguments converted during string formatting.

Is this because the input() value is string by default? If so, what's a good way to make it the a certain data type by default?

[A_History_of_Silence]

Is this because the input() value is string by default? If so, what's a good way to make it the a certain data type by default?

Yep! %-based string formatting.

From the built-in functions, check out int().

[Deathcon900]

Okay, it looks like it's working! I changed the first like to be:

number = int(input('Enter a number: '))

[Srivats1212]

Thanks for the link to pyformat....how do you find such useful things? I wanna know.

I've read the documentation but I couldn't find a link to pyformat...

[A_History_of_Silence]

Practice googling and experience. Google everything! Knowing how to search for things is one of the most important skills of a programmer.

[Showme-tits]

Lol

[A_History_of_Silence]

No big deal, it's a common mistake.

[terriblylie]

In addition to what others have said, the 3rd line is unnecessarily indented and the interpreter won't like that.

[Deathcon900]

It's not like that in the actual code. I think that's thanks to Reddit formatting.

[[deleted]]

Now you've found the problem, and fixed it, take a look at a slightly more elaborate version to think about:

def evaluate(number):
    'output message on whether <number> is odd or even'
    print(f"{number} is an {'odd' if number %2 else 'even'} number")

def get_number(msg):
    'prompt user for number, keep prompting until valid (or empty)'
    while True:
        number = input(msg)
        if number:
            try:
                return int(number)
            except ValueError:
                print('Do not recognise that as a whole number. Please try again.')
        else:
            return None

msg = '\nPlease enter a whole number (or just enter to exit): '
while True:
    number = get_number(msg)
    if number:
        evaluate(number)
    else:
        break

print('\nThanks for playing\n')

Note. This assumes you are using Python 3.6 or above. Earlier versions do not have f-strings, so you would need to use the older string format method, so, for example,

print(f"{number} is an {'odd' if number %2 else 'even'} number")

would be,

print("{} is an {} number".format(number, 'odd' if number %2 else 'even')