Can't multiply sequence by non-int of type 'float' ERROR when trying to multiply a float number with len(list)

Question

I'm trying to take a random sample from a list given SPLIT_SIZE = 0.9, but I'm having the following error:

TypeError: can't multiply sequence by non-int of type 'float'.

This is the line of code that is giving the error:

list = os.listdir(SOURCE)
training_set = random.sample(list, float(SPLIT_SIZE)*int(len(list)))

where SOURCE is a directory containing images.

Answer 1

The second argument of random.sample have to be integer type.