python coding....

Need help getting the task 3 to work... Here is what I have done so far:

from scipy import *

from pylab import *

from numpy import *

#TASK 1

class Interval:

def __init__(self, a, b=None):

if b==None:

b=left

self.a=a

self.b=b

#TASK 2

def __add__(self,other):

a,b = self.a, self.b

if isinstance(other, int) or isinstance(other, float):

c,d= other,other

return Interval(a+c, b+d)

if isinstance(other, Interval):

c,d = other.a,other.b

return Interval(a+c, b+d)

def __radd__(self, other):

return self + other

def __sub__(self, other):

a,b=self.a, self.b

if isinstance(other, int) or isinstance(other, float):

c,d = other,other

return Interval(a-d, b-c)

elif isinstance(other,Interval):

c, d = other.a, other.b

return Interval(a-d, b-c)

return Interval(a-d, b-c)

def __rsub__(self,other):

if isinstance(other, int) or isinstance(other,float):

return (Interval(other)-self)

def __mul__(self,other):

a,b=self.a,self.b

if isinstance(other, int) or isinstance(other,float):

c,d=other,other

return (Interval(min(a*c,a*d,b*c,b*d),max(a*c,a*d,b*c,b*d))

elif isinstance(other, Interval):

c,d=other.a, other.b

return (Interval(min(a*c,a*d,b*c,b*d),max(a*c,a*d,b*c,b*d))

def __rmul__(self,other):

if isinstance(other,int) or isinstance(other,float):

return (self*other)

def __truediv__(self,other):

a,b=self.a,self.b

if isinstance(other, int) or isinstance(other,float):

c,d=other,other

if c*d==0:

raise ValueError('0 in denominator' % other)

else:

return (Interval(min(a/c,a/d,b/c,b/d),max(a/c,a/d,b/c,b/d))

elif isinstance(other,Interval):

c,d=other.a, other.b

if c*d==0:

raise ValueError('0 in denominator' % other)

else:

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.a,self.b)

Task 1 Construct a class Interval which is initialized with two real numbers representing the left and right endpoints respectively. Task 2 Provide methods for the four basic arithmetic operations Task 3 Provide a print method so that the code Interval (1,2) prints 1, 2]