im getting a type error and idk how to fix it

Question

class Complex:
def __init__(self,real='',imaginary='_'):
if(real=='' and imaginary==''):
self.real=int(input("Enter real part = "))
self.imaginary=int(input("Enter imaginary part = "))
else:
self.real=real
self.imaginary=imaginary
def _add_(self,other):
real=self.real+other.real
imaginary=self.imaginary+other.imaginary
s3=Complex(real,imaginary)
return s3
def _sub_(self,other):
real=self.real-other.real
imaginary=self.imaginary-other.imaginary
s3=Complex(real,imaginary)
return s3
def _repr_(self):
return("Real part = {}, Imaginary part = {}".format(self.real,self.imaginary))
a=Complex()
b=Complex()
c=a+b
print(a)
print(b)
print(c)

Answer 1

class Complex:
def __init__(self,real='',imaginary=''):
if(real=='' and imaginary==''):
self.real=int(input("Enter real part = "))
self.imaginary=int(input("Enter imaginary part = "))
else:
self.real=real
self.imaginary=imaginary
def __add__(self,other):
real=self.real+other.real
imaginary=self.imaginary+other.imaginary
s3=Complex(real,imaginary)
return s3
def __sub__(self,other):
real=self.real-other.real
imaginary=self.imaginary-other.imaginary
s3=Complex(real,imaginary)
return s3
def __repr__(self):
return("Real part = {}, Imaginary part = {}".format(self.real,self.imaginary))
a=Complex()
b=Complex()
c=a+b
print(a)
print(b)
print(c)

Answer 2

Try putting double underscores around add and sub (so __add__ and __sub__). Magic Methods require double underscores. Same with repr.

Answer 3

i removed the underscores from the add, sub and repr functions. its running but im getting an error on line 26 which is "c=a+b"
This is the updated code:
class Complex:
def __init__(self,real='',imaginary=''):
if(real=='' and imaginary==''):
self.real=int(input("Enter real part = "))
self.imaginary=int(input("Enter imaginary part = "))
else:
self.real=real
self.imaginary=imaginary
def add(self,other):
real=self.real+other.real
imaginary=self.imaginary+other.imaginary
s3=Complex(real,imaginary)
return s3
def sub(self,other):
real=self.real-other.real
imaginary=self.imaginary-other.imaginary
s3=Complex(real,imaginary)
return s3
def repr(self):
return("Real part = {}, Imaginary part = {}".format(self.real,self.imaginary))
a=Complex()
b=Complex()
c=a+b
print(a)
print(b)
print(c)

Answer 4

Why did you remove them? I said to put double underscores.

Answer 5

i did put double underscores, but i was getting the same error and the output was not asking or an input. but when i removes them and ran it again, it asked for the output and then showed the error

Answer 6

OOHHH nvm i got it

Answer 7

Thanks for your help Russ

Answer 8

Why did we add the double underscores??

Answer 9

__add__ is the Magic Method for the "+" sign. When you create classes, you might need to define behaviour between two objects. When a + b is executed, it looks to the class magic method __add__ to find out what to do.

Answer 10

Oh Okay, thanks!!