Python Forum

The following code

class interval:
    def __init__(self,left,right):
        self.right=right
        self.left=left
    def __add__(self,other):
        a,b,c,d = self.left, self.right, other.left, other.right
        return interval(a+c,b+d)
    
    def __sub__(self,other):
        a,b,c,d=self.left,self.right,other.left,other.right
        return interval(min(a,b)-max(c,d),max(a,b)-min(c,d))
    def __mul__(self,other):
        a,b,c,d=self.left,self.right,other.left,other.right
        return interval(min(a*c, a*d, b*c, b*d),
                            max(a*c, a*d, b*c, b*d))
    def __div__(self, other):
        a, b, c, d = self.lo, self.up, other.lo, other.up
        # [c,d] cannot contain zero:
        print(min(a/c, a/d, b/c, b/d))
        
        if c*d <= 0:
            raise ValueError ('Interval %s cannot be denominator because it contains zero' % other)
        
        return interval(min(a/c, a/d, b/c, b/d), max(a/c, a/d, b/c, b/d))
    
    def __repr__(self):
        return '[{},{}]'.format(self.left,self.right)

I1 = Interval(1, 4)
I2 = Interval(-2, -1)
print(I1 + I2)       
print(I1-I2)
print(I1*I2)
print(I1/I2)

gives me the following error:

Error:
File "C:/Users/Desktop/python ode/homework2.py", line 52, in __truediv__
    raise ValueError('Please make sure values is of sort int and x !=0')

ValueError: Please make sure values is of sort int and x !=0

and I am not sure what to do to fix it.

There are less than 52 lines, how could there be an error on line 52?

it looks like that the error is contained within the command __truediv__,
therefore might not have anything to do directly with the code I wrote.

We need the full error message and we need the file name of the above code in order to see where it fails.

this is everything that is printed out after I run it.

Error:
runfile('C:/UsersDesktop/python ode/extrial.py', wdir='C:/Users/Desktop/python ode')
[-1, 3]
[2, 6]
[-4, -1]
Traceback (most recent call last):

  File "<ipython-input-779-717f169c285d>", line 1, in <module>
    runfile('C:/Users/Desktop/python ode/extrial.py', wdir='C:/Users/Desktop/python ode')

  File "C:\Users\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 668, in runfile
    execfile(filename, namespace)

  File "C:\Users\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 108, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/Desktop/python ode/extrial.py", line 111, in <module>
    print(I1/I2)

  File "C:/Users/Desktop/python ode/homework2.py", line 52, in __truediv__
    raise ValueError('Please make sure values is of sort int and x !=0')

ValueError: Please make sure values is of sort int and x !=0

This code cannot possible run, because you class definition is with small i - class interval and you instantiate Interval

also what is homework2.py?

solved, the problem was the capitalization.
Thanks a lot.
That is the name of the file.

(May-07-2019, 11:08 AM)mcgrim Wrote: [ -> ]That is the name of the file.

If that's the name of the file, what is extrial.py?

sorry, I involuntarily created some confusion.
I have two different files next to each other, and I must have copy/pasted
from the other one.