I don't know how to distinguish between an integer and a decimal

I tried using a simple function after asking for a decimal d but realized that the exception is that it didn’t catch the difference between 8, and 8.0, and don’t really know how to fix it. I tried saving them into strings and comparing them but that didn’t work either.

def validdec():
    if d == round(d):
        print("Invalid decimal.")
    else:
        print("Valid Decimal.")

>Solution :

Dunno if this is what you need but you can use the function isinstance to do this.

def validdec(d): 
    if isinstance(d, int): 
        print("Invalid decimal.") 
    else: print("Valid Decimal.")

validdec(1.2)
# Output: Valid decimal.

validdec(1)
# Output: Invalid decimal.

You can also do it like this for a cute looking one-liner:

def validdec(d): print("Invalid decimal.") if isinstance(d, int) else print("Valid Decimal.")

More about isinstance: https://docs.python.org/3/library/functions.html#isinstance

EDIT: As suggested from wjandrea:

def validdec(d): 
    print("Invalid" if isinstance(d, int) else "Valid", "decimal.")