TypeError: '>' not supported between instances of 'method' and 'int'

user_10532947 0
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I hoping someone can help with this.

I have created a class with a function in it that counts the total cars in 4 lists of cars.

On another script I am creating the interface and want to say if the answer to 'totalCars' is bigger than zero then proceed to offer a type of car.

However when I do this I get this error: TypeError: '>' not supported between instances of 'method' and 'int'. Here is the code:

def totalCars(self):
    p = len(self.getPetrolCars())
    e = len(self.getElectricCars())
    d = len(self.getDieselCars())
    h = len(self.getHybridCars())
    totalCars = int(p) + int(e) + int(d) + int(h)
    return totalCars

And on the interface script have:

while self.totalCars > 0:

To get around this I tried to use a boolean, like this: 

def totalCars(self):
    p = len(self.getPetrolCars())
    e = len(self.getElectricCars())
    d = len(self.getDieselCars())
    h = len(self.getHybridCars())
    totalCars = int(p) + int(e) + int(d) + int(h)
    if totalCars > 0:
        return True

And on the app script I have:

 while self.totalCars is True

But this totally crashed the program and won't run at all.

Any guidance welcome here. Many thanks.

comparison-operators python
4 Answers

That's because self.totalCars is a method and you need to call it to get it's return value by adding a couple parenthesis at the end, like so:

while self.totalCars() > 0:
     #Insert the rest here

Otherwise, like the message says, you're comparing a method with a number, and that's not gonna work.

No need to add a boolean, but if you insisted on using one, you could do something like:

while self.totalCars():    #Will run if self.totalCars() RETURNS True

Again, this didn't really work in your original code because you forgot the parenthesis.

Hope this helps.

user_88941310

For your last question, you just need this:

while self.totalCars():

Call the method, but don't check against Trueif it returns a Boolean.

Also

def totalCars(self):

should end with:

return False

You should also point the exact location of the error next time.

user_22667720

Without calling method, no data is return so it can't be compared to a number.

you just add "()"

while self.totalCars > 0:
=> while self.totalCars() > 0:
user_123479490

Same when you are using count,

I had this issue when I were using count

Model1.objects.filter(user=self.user).count > 1

Adding parentheses after count will make it work 

Model1.objects.filter(user=self.user).count() > 1
user_151880260
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