TypeError: unsupported operand type(s) for -: float and NoneType python

TypeError: unsupported operand type(s) for -: float and NoneType python

Judging by what youve provided, and the error this is my conclusion.

The only place you use the - operand is in the two points

sq_err = (rating- predicted_rating) * (rating - predicted_rating)

because the error states float and NoneType we can conclude that rating is type float and predicted_rating is NoneType.

You defined predicted_rating as:

predicted_rating = simple_nn(person_id, place_id, 5)

So this means that somewhere in your code for the function simple_nn you are not returning anything. Perhaps if you used conditions you didnt evaluate every end path and the function simply returned.

for example… all of these functions return the None type.

def example1():
    pass

def example2():
    return

def example3(a = True, b  = True):
    if not a:
        return True
    elif not b:
        return False

Note in the last example there is a path where neither if case is satisfied,.. thus it could return None

you can also use import division

from _ _ future _ _ import division

it worked for me in same case

TypeError: unsupported operand type(s) for -: float and NoneType python

In my case, I forgot to add

return

to the computed expression in the function definition.

Example:

def drift(y, t): theta*(mu-y)  # define OUP drift term
def diffusion(y, t): sigma  # define OUP diffusion term

will return the type None when called,

where as,

def drift(y, t): return theta*(mu-y)  # define OUP drift term
def diffusion(y, t): return sigma  # define OUP diffusion term

will return actual numbers