Multi tool use

infinite Fibonacci generator in python with yield error?

def fib_gen():
a, b = 0, 1
while True:
yield a
a, b = b, a + b

print(next(fib_gen()))
print(next(fib_gen()))
print(next(fib_gen()))
print(next(fib_gen()))

Output: 0
0
0
0


I am trying to create an infinite Fibonacci generator in python. Please help ... Where am I doing wrong ?

2 Answers
2

Each call to fib_gen() creates a new generator that is in initial state. Try assigning the return value of fib_gen() to a variable and calling next() on that same variable.

fib_gen()

fib_gen()

next()

You first need to create a generator object:

def fib_gen():
a, b = 0, 1
while True:
yield a
a, b = b, a + b


generator = fib_gen()

print(next(generator))
print(next(generator))
print(next(generator))
print(next(generator))


The output is:

0
1
1
2


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