I need my code to only accept float values

Question

def check_datatype (data,datatype,message):


        if datatype == "Float":
            if not data:
                if not data:
                    print(message)
                return False,data
            else:
                return True,data


check = False
while not check:
    some_text = input('Input a float: ')
    check,a_float = check_datatype(some_text,"Float","You must input a number")
print(a_float)

I've tried using .isdecimal but it is not working (If not data.isdecimal ) This second part of the code is correct but the first part is wrong somehow.

Answer 1

You can use .isinstance() to get True of False if the value is defined type.

value = 5

print(isinstance(value, float))

# Returns False

In your if statement:

if isinstance(value, float):
    print(value, "is float")
elif isinstance(value, int):
    print(value, "is interger")

Answer 2

I suggest using if isinstance(datatype,float): instead of if datatype == "Float":

Answer 3

As other users suggested, isinstance is very helpful in these situations.

Your code should look like this:

def funct(data: float) -> (bool, float):
    isFloat = False
    if isinstance(data, float):
        isFloat = True
    else:
        print("message")
    return (isFloat, data)