iPython crashes on printing Fibonacci Series

Question

While attempting to print a fibonacci series using tuples, iPython tends to crash.

Here is the code I am trying to execute.

n = raw_input("Please enter a number: ")

a = 0
b = 1
while b < n:
    (b,a) = (a,b+a)
    print b

However, if I replace n with a number (eg. 20, 100, 1000), it runs smoothly. I also tried to run this code in Pycharm, with similar results. Pycharm ran the code, with a huge stream on numbers being generated, and a warning which read:

Too much output to process

What causes this crash?

score 1 · Accepted Answer · answered Apr 29 '16 at 14:58

1

You forgot to turn the string n you get from raw_input into an integer.

Since the comparison is done by type name in this case b < n will always be True.

Use n = int(raw_input("Please enter a number: "))

answered Apr 29 '16 at 14:58

timgeb

76,762
20
123
145

Thank you, I was unaware that raw_input needed to be coerced into integer type. – user2762934 Apr 29 '16 at 15:06

score 0 · Answer 2 · answered Apr 29 '16 at 14:58

0

Because the return value of raw_input is str, you should try n = int(raw_input("Please enter a number: ")) instead.

answered Apr 29 '16 at 14:58

BoscoTsang

394
1
14

iPython crashes on printing Fibonacci Series

2 Answers2