What's the error?

Question

class FibGenerator:
def __next__(self):
self.first = 0
self.second = 1
def __iter__(self):
return self
def __next__(self):
fibNum = self.first+self.second
self.first=self.second
self.second = fibNum
return fibNum

fib =FibGenerator()
for i in range(1,10):
print(next(fib))

*This code is giving an error - "Traceback (most recent call last):
File "D:/Study/Python/Tutorial/Comprehension/Prog.py", line 15, in <module>
print(next(fib))
File "D:/Study/Python/Tutorial/Comprehension/Prog.py", line 8, in __next__
fibNum = self.first+self.second
AttributeError: 'FibGenerator' object has no attribute 'first'
"*

How to solve this error?

Answer 1

This code runs. I think you want to initialize second to 1 instead of -1 on line 8 also.
https://code.sololearn.com/cozj3wiGqMk5

Answer 2

John Wells Yes but he has not defined constructor in code copied in description

Answer 3

Your have defined two time __next__ method. and i think that first one its the ctor of FibGenerator class